Hua tuo is a scholar, a square scholar and a scholar. Pei Xiang, Chen Gui, Qiu and Huang Wan all refused. When people know the cultivation of nature, they think they are 100 years old and have a strong appearance. It is also a refined prescription, which can cure diseases, but there are only a few kinds of soup. The heart is divided into different doses and will not be weighed. Drink it when it's cooked, saying it's economical, discarded and cured. If moxibustion is used, there will be one or two places, and each place will be seven or eight strong, and the disease will be removed.
If you are a needle, it's only one or two places. If you were a needle, you would say, "When you lead a promise, if you arrive, you will talk to people." If the patient says "it's time", he has to pull out the needle and his condition will get worse. If the disease accumulates, neither acupuncture nor medicine can reach it. Drink it when it is necessary to cut it, and you will be as drunk as death without knowing it for a moment. If the disease is in the intestine, break it and wash it, and wipe the abdomen with ointment. It takes four or five days, and it doesn't hurt, and people won't slap themselves. In January, they will calm down.
Therefore, Mrs. Gan Lingxiang was pregnant for six months and had abdominal pain and discomfort. She felt her pulse and said, "The fetus is dead." Let people know where it is. It's a man on the left and a woman on the right. The parrot is "on the left", so it is soup, and the fruit is male, that is, the more.
Yin Shi, a county magistrate, has four major troubles: he is thirsty, doesn't like to hear people talk, and urinates badly. Hey: "try to cook hot dishes, the more you sweat;" Don't worry, you will die within three days. " Even if you don't sweat when cooking hot dishes, you will say, "The hidden qi has disappeared, and you should cry to death." Come as promised.
Officials in the government searched and Li Yan stopped them, all of which were headaches and brain fever, and the suffering was similar. Hehe: "Look for it now, and you will sweat." It may be difficult to make a difference, saying, "Seeking external reality and delaying internal reality should be treated differently." In other words, every medicine has Mingdan and Shengdan.
The salt blasphemer waited for him with several people. When he arrived, he said to Xin, "How are you?" Xin Dao: "Peace of mind." He said, "You are in a hurry. Don't drink too much." After returning home, a few miles later, Xin died in the middle of the night.
Therefore, Du You made a sacrifice and said that he was ill, so he looked at his pulse and said, "If you are still weak, you will die if you don't come back." When you die, spit out a few inches of your tongue. "His wife heard that he was ill, and came from more than one hundred miles away to save him. She didn't stay any longer and handed him over. She became ill in three days, just as she said.
Du Yi fell ill and went to the province. Yi said, "Yesterday I asked Dr. Liu to rent a needle and a stomach tube. He had a bad cough and wanted to lie down." He said, "If you can't stab the stomach tube, you will miss the liver. Eat less that day and don't save it for five days. " This is like a slogan.
Chen Shushan, a boy from Dongyang, was ill when he was two years old. He often cries first at the next profit and falls asleep every day. When asked, she said, "Her mother is pregnant with her body, the yang is raised in it, the milk is cold, and the child is cold by her mother, so she will recover from time to time." Tuo and Siwu Queen Pills will be eliminated in 10 days.
Pengcheng couples go to the toilet at night, stinging their hands and moaning hooligans. If the soup is hot, the soldier will be sleepy, but the person next to him is Yi Tang. If the soup is hot, the soldier will be cured.
Mei Ping, a military official, fell ill and went home after being removed from the list. He lived in Guangling, but he didn't reach 200 miles, so he left his family. For a while. When I arrived at Master Xu, he told me to look at Ping. Ping said, "You saw me earlier, but you didn't come. Now that I am well, I can see my family when I catch up, and I will die in five days. " If you are engraved, return at the right time.
Walking in the street, I saw a man, choking with illness, addicted to food and unable to get down. His family wants to drive to see a doctor. Hearing his moan, he stopped to look at him. He said, "There is a cake seller along the road. The garlic is too big. Take three liters to drink, and go if you are sick. " You mean spit out the snake with one word? [ 1]? One, hanging by the car, wants to make a meal. Before he could return it, the little boy saw the joke in front of him and said to himself, "It seems that I was on a business trip and threw up by the car." After the patient sat down, he saw about a dozen snakes hanging on the wall in Tuobei.
Another county magistrate was ill, but he thought he was more angry, but he was more influenced by other goods and didn't treat him, so he had no choice but to leave a book to scold him for his great anger and let people kill him. The county magistrate knows, and there is no need to chase. It was hard to keep the spine, and I vomited several liters of black blood.
Another scholar-bureaucrat was unhappy. He said, "You are very ill, so you have to break your stomach. However, JUNSHOU is only ten years old, and he can't kill you because of his illness. When he was ten years old, he was going to die, so he split up. " Scholar-officials can't stand pain, so they must get rid of it. So I laid hands on him, looking for a poor student and died ten years later.
Chen Deng, the magistrate of Guangling, was ill, flushed and didn't eat. Pulse said, "Fu Jun has several liters of worms in his belly. He wants to become gangrene, so he eats fishy things." Is to make two liters of soup, take one liter first, and be sure to do your best. After eating for a while, I vomited three liters of worms, my head moved, and I was covered with raw fish. The more I ate, the worse I felt. He said, "The disease will break out in the last three stages, and it will be saved if you meet a good doctor." If you start by date, you will die if you are absent.
Hearing this, Mao screamed and stayed with him all the time. Every time Mao gets wind, he is confused and dizzy. It is a needle, but it is very convenient.
General Li's wife is very ill. Take her pulse. Yue: "I'm pregnant and I can't go." The general said: "I heard that I was pregnant and injured, and the fetus was gone." Hehe: "The case pulse, the fetus has not gone." The general doesn't think so. Give it up, girl. Almost. After more than 100 days, I snored like thunder. Hey: "This pulse story has a fetus. I should have given birth to two children before, one came out first and lost a lot of blood, and the other died. Mother is unconscious, and she can't be born without being slapped. If the fetus dies and the blood vessels don't return, it will dry the mother's spine, so it will make the spine ache. Now it's time for an injection with soup, and this stillbirth will come out. "
When the soup needle is added, the woman is in pain, as if she were going to have a baby. He said: "This stillbirth has withered for a long time and can't get out by itself. It is best for someone to explore. " Guoguo is a dead man with complete limbs and black color, which is a foot long.
Stunt skills, all the same.
However, as a scholar, I often regret linking my career with medicine. After Mao's personal care, he was seriously ill and let him watch it exclusively. He said, "It's hard to help in the near future. If we keep attacking and treating things, we can extend the years. " He was homesick for a long time because he said, "I want to return my ears for a while." At home, I resigned myself to my wife's illness and calculated the begging period. Mao hated books and sent them to the county. His parents can be anorexia, but they still don't go on the road.
Mao was furious and made people check; If the wife is sick, give adzuki bean 40 welcome and take a day off; If it is fraud, accept and send it. So he sent it to Xu prison to try on the first suit. Yu Xun asked: "Skills are practical, and people's lives are at a critical juncture, so they should be included." Mao said, "Don't worry, when there is no such mouse in the world?" Then I failed the exam. When he died, he wrote a book to the prison guard, saying, "This can be a living person." Officials are afraid of the law, not strong, so please fire. After his death, Mao's hair style has not been eliminated. Mao said, "You can recover from this. Little people have raised my illness, so I should respect myself. However, I will not kill this son, nor will I break this original ear for me. " Later, when his beloved son Cang Shu was sick and sleepy, Mao sighed, "I regret killing Hua Tuo, which caused this son to die."
At the beginning, the military commander Li Cheng coughed badly, stayed up all night, and sometimes vomited pus and blood for questioning. He said, "You have a carbuncle, but what you spit in the hole is not in your lungs. I'll share two dollars with you, and when you vomit more than two liters of pus, you can support yourself quickly. You can start from January, love yourself and be healthy for one year. At the age of eighteen, when you are a child, you can eat this powder and get bad. If you don't take this medicine, you will die. " After two dollars, you can get the medicine.
At the age of five or six, if a pro-China person succeeds in getting sick, he will say, "Your Majesty is strong now, and I want to die. Why can't I bear to rush to take medicine and wait for misfortune? " Lend me money first, but I'm poor, so I can get more money from Huatuo to Daqing. "Go in. I came late, so I was in a hurry to get it. At the age of eighteen, he fell ill, had no medicine, and died.
Fan A of Guangling and Pengcheng both learned from school. Puyi is accurate and helpful. As the saying goes, "the human body should do work, but it should not be extreme." Shake it, the valley gas will disappear, the blood will circulate, and the disease will not be born. For example, it is immortal. It is guided by ancient immortals, who care about the bear's neck, hold the waist and move the joints in order to grow old.
I have a skill, five birds play: one is a tiger, the other is a deer, the third is a bear, the fourth is an ape and the fifth is a bird. It is also used to eliminate diseases and sharpen hoofs and feet as a guide. When I was unhappy, I began to play the role of a bird, sweating profusely. Because of being powdered, my body is light and I want to eat it. "Popularization, more than ninety years old, smart eyes and ears, strong teeth. Ashan acupuncture. Every doctor should not make the mistake of storing needles on his back and chest. There are only four points in the needle, but one needle goes in one or two inches, and the giant sparrow chest stores needles down five or six inches, and all diseases are cured.
A Cong asked who could benefit from food and painted him a green sticker. One liter of lacquer leaf crumbs, 14 taels of green sticky crumbs, as the rate, will kill three worms for a long time, benefit five treasures, and lighten the body, so that the head is not white. A listened to him and lived for more than a hundred years. Lacquer leaves are everywhere, and green sticky leaves are born in Feng, Pei, Pengcheng and Chaogeyun.
2. Later Han Hua Tuo biography [Wei Jin] Chen Shou
Hua tuo is a scholar, a square scholar and a scholar. Pei Xiang, Chen Gui, Qiu and Huang Wan all refused. When people know the cultivation of nature, they think they are 100 years old and have a strong appearance. It is also a refined prescription, which can cure diseases, but there are only a few kinds of soup. The heart is divided into different doses and will not be weighed. Drink it when it's cooked, saying it's economical, discarded and cured.
If moxibustion is used, there will be one or two places, and each place will be seven or eight strong, and the disease will be removed. If you are a needle, it's only one or two places. If you were a needle, you would say, "When you lead a promise, if you arrive, you will talk to people." If the patient says "it's time", he has to pull out the needle and his condition will get worse. If the disease accumulates, neither acupuncture nor medicine can reach it. Drink it when it is necessary to cut it, and you will be as drunk as death without knowing it for a moment. If the disease is in the intestine, break it and wash it, and wipe the abdomen with ointment. It takes four or five days, and it doesn't hurt, and people won't slap themselves. In January, they will calm down.
Therefore, Mrs. Gan Lingxiang was pregnant for six months and had abdominal pain and discomfort. She felt her pulse and said, "The fetus is dead." Let people know where it is. It's a man on the left and a woman on the right. The parrot is "on the left", so it is soup, and the fruit is male, that is, the more.
Yin Shi, a county magistrate, has four major troubles: he is thirsty, doesn't like to hear people talk, and urinates badly. Hey: "try to cook hot dishes, the more you sweat;" Don't worry, you will die within three days. " Even if you don't sweat when cooking hot dishes, you will say, "The hidden qi has disappeared, and you should cry to death." Come as promised.
Officials in the government searched and Li Yan stopped them, all of which were headaches and brain fever, and the suffering was similar. Hehe: "Look for it now, and you will sweat." It may be difficult to make a difference, saying, "Seeking external reality and delaying internal reality should be treated differently." In other words, every medicine has Mingdan and Shengdan.
The salt blasphemer waited for him with several people. When he arrived, he said to Xin, "How are you?" Xin Dao: "Peace of mind." He said, "You are in a hurry. Don't drink too much." After returning home, a few miles later, Xin died in the middle of the night.
Therefore, Du You made a sacrifice and said that he was ill, so he looked at his pulse and said, "If you are still weak, you will die if you don't come back." When you die, spit out a few inches of your tongue. "His wife heard that he was ill, and came from more than one hundred miles away to save him. She didn't stay any longer and handed him over. She became ill in three days, just as she said.
Du Yi fell ill and went to the province. Yi said, "Yesterday I asked Dr. Liu to rent a needle and a stomach tube. He had a bad cough and wanted to lie down." He said, "If you can't stab the stomach tube, you will miss the liver. Eat less that day and don't save it for five days. " This is like a slogan.
Chen Shushan, a boy from Dongyang, was ill when he was two years old. He often cries first at the next profit and falls asleep every day. When asked, she said, "Her mother is pregnant with her body, the yang is raised in it, the milk is cold, and the child is cold by her mother, so she will recover from time to time." Tuo and Siwu Queen Pills will be eliminated in 10 days.
Pengcheng couples go to the toilet at night, stinging their hands and moaning hooligans. If the soup is hot, the soldier will be sleepy, but the person next to him is Yi Tang. If the soup is hot, the soldier will be cured.
Mei Ping, a military official, fell ill and went home after being removed from the list. He lived in Guangling, but he didn't reach 200 miles, so he left his family. For a while. When I arrived at Master Xu, he told me to look at Ping. Ping said, "You saw me earlier, but you didn't come. Now that I am well, I can see my family when I catch up, and I will die in five days. " If you are engraved, return at the right time.
Walking in the street, I saw a man, choking with illness, addicted to food and unable to get down. His family wants to drive to see a doctor. Hearing his moan, he stopped to look at him. He said, "There is a cake seller along the road. The garlic is too big. Take three liters to drink, and go if you are sick. " You mean spit out the snake with one word? [ 1]? One, hanging by the car, wants to make a meal. Before he could return it, the little boy saw the joke in front of him and said to himself, "It seems that I was on a business trip and threw up by the car." After the patient sat down, he saw about a dozen snakes hanging on the wall in Tuobei.
Another county magistrate was ill, but he thought he was more angry, but he was more influenced by other goods and didn't treat him, so he had no choice but to leave a book to scold him for his great anger and let people kill him. The county magistrate knows, and there is no need to chase. It was hard to keep the spine, and I vomited several liters of black blood.
Another scholar-bureaucrat was unhappy. He said, "You are very ill, so you have to break your stomach. However, JUNSHOU is only ten years old, and he can't kill you because of his illness. When he was ten years old, he was going to die, so he split up. " Scholar-officials can't stand pain, so they must get rid of it. So I laid hands on him, looking for a poor student and died ten years later.
Chen Deng, the magistrate of Guangling, was ill, flushed and didn't eat. Pulse said, "Fu Jun has several liters of worms in his belly. He wants to become gangrene, so he eats fishy things." Is to make two liters of soup, take one liter first, and be sure to do your best. After eating for a while, I vomited three liters of worms, my head moved, and I was covered with raw fish. The more I ate, the worse I felt. He said, "The disease will break out in the last three stages, and it will be saved if you meet a good doctor." If you start by date, you will die if you are absent.
Hearing this, Mao screamed and stayed with him all the time. Every time Mao gets wind, he is confused and dizzy. It is a needle, but it is very convenient.
General Li's wife is very ill. Take her pulse. Yue: "I'm pregnant and I can't go." The general said: "I heard that I was pregnant and injured, and the fetus was gone." Hehe: "The case pulse, the fetus has not gone." The general doesn't think so. Give it up, girl. Almost. After more than 100 days, I snored like thunder. Hey: "This pulse story has a fetus. I should have given birth to two children before, one came out first and lost a lot of blood, and the other died. Mother is unconscious, and she can't be born without being slapped. If the fetus dies and the blood vessels don't return, it will dry the mother's spine, so it will make the spine ache.
Today, with soup and needles, this stillbirth has come out. "Soup needle added, women hurt. He said: "This stillbirth has withered for a long time and can't get out by itself. Someone better explore it. "The fruit is a dead man, with complete limbs, black color and a foot long.
Stunt skills, all the same.
However, as a scholar, I often regret linking my career with medicine. After Mao's personal care, he was seriously ill and let him watch it exclusively. He said, "It's hard to help in the near future. If we keep attacking and treating things, we can extend the years. " He was homesick for a long time because he said, "I want to return my ears for a while." At home, I resigned myself to my wife's illness and calculated the begging period. Mao hated books and sent them to the county. His parents can be anorexia, but they still don't go on the road. Mao was furious and made people check; If the wife is sick, give adzuki bean 40 welcome and take a day off; If it is fraud, accept and send it. So he sent it to Xu prison to try on the first suit. Yu Xun asked: "Skills are practical, and people's lives are at a critical juncture, so they should be included." Mao said, "Don't worry, when there is no such mouse in the world?" Then I failed the exam.
When he died, he wrote a book to the prison guard, saying, "This can be a living person." Officials are afraid of the law, not strong, so please fire. After his death, Mao's hair style has not been eliminated. Mao said, "You can recover from this. Little people have raised my illness, so I should respect myself. However, I will not kill this son, nor will I break this original ear for me. " Later, when his beloved son Cang Shu was sick and sleepy, Mao sighed, "I regret killing Hua Tuo, which caused this son to die."
At the beginning, the military commander Li Cheng coughed badly, stayed up all night, and sometimes vomited pus and blood for questioning. He said, "You have a carbuncle, but what you spit in the hole is not in your lungs. I'll share two dollars with you, and when you vomit more than two liters of pus, you can support yourself quickly. You can start from January, love yourself and be healthy for one year. At the age of eighteen, when you are a child, you can eat this powder and get bad. If you don't take this medicine, you will die. " After two dollars, you can get the medicine.
At the age of five or six, if a pro-China person succeeds in getting sick, he will say, "Your Majesty is strong now, and I want to die. Why can't I bear to rush to take medicine and wait for misfortune? " Lend me money first, but I'm poor, so I can get more money from Huatuo to Daqing. "Go in. I came late, so I was in a hurry to get it. At the age of eighteen, he fell ill, had no medicine, and died.
Fan A of Guangling and Pengcheng both learned from school. Puyi is accurate and helpful. As the saying goes, "the human body should do work, but it should not be extreme." Shake it, the valley gas will disappear, the blood will circulate, and the disease will not be born. For example, it is immortal. It is guided by ancient immortals, who care about the bear's neck, hold the waist and move the joints in order to grow old. I have a skill, five birds play: one is a tiger, the other is a deer, the third is a bear, the fourth is an ape and the fifth is a bird. It is also used to eliminate diseases and sharpen hoofs and feet as a guide. Being unhappy and playing like a bird. I am sweating like a pig. Because I am pink and light, I want to eat. "On the whole, he is over 90 years old, with a keen eye, bright eyes and strong teeth. Ashan acupuncture.
Every doctor should not make the mistake of storing needles on his back and chest. There are only four points in the needle, but one needle goes in one or two inches, and the giant sparrow chest stores needles down five or six inches, and all diseases are cured. A Cong asked who could benefit from food and painted him a green sticker. One liter of lacquer leaf crumbs, 14 taels of green sticky crumbs, as the rate, will kill three worms for a long time, benefit five treasures, and lighten the body, so that the head is not white. A listened to him and lived for more than a hundred years. Lacquer leaves are everywhere, and green sticky leaves are born in Feng, Pei, Pengcheng and Chaogeyun.
Extended data
1, Hua Tuo's life:
Hua tuo likes reading since he was a child. When I was young, I traveled to Xuzhou and was familiar with all kinds of classics and health care. , Gui, Qiu Huangwan, etc. all recommended him to be an official, but he refused. He is determined to help the world with drugs and relieve people's suffering. Huatuo's medical practice covers parts of Anhui, Jiangsu, Shandong and Henan, and is deeply loved and respected by the masses.
Hua Tuo is not only good at acupuncture, but also has high attainments in obstetrics and gynecology, pediatrics, miscellaneous diseases of internal medicine and parasitic diseases. His greatest achievement is in surgery. He developed Mafei Powder, which successfully enabled patients to perform abdominal surgery under general anesthesia. According to historical records, Hua Tuo has been able to perform surgery such as tumor resection and gastrointestinal suture.
He used surgery to treat diseases that occurred in the body, but these diseases could not be cured by acupuncture and drugs. He first took the patient with hemp boiling powder and wine, and when the patient was so drunk that he lost consciousness, he cut the abdominal wall. If the tumor was removed; If the disease is in the intestines and stomach, cut off the intestines and stomach, remove the diseased part, sew it up after washing, and apply ointment to the wound. The wound will heal in four or five days, and the patient will recover in a month or so. Mafeisan is a traditional Chinese medicine anesthetic used for general anesthesia.
Hua Tuo invented general anesthesia in the second and third centuries, which was more than 600 years before western doctors used ether or nitrous oxide for general anesthesia. Therefore. Hua Tuo is not only the first person in China, but also the first person in the world to have abdominal surgery under anesthesia.
Hua Tuo also attaches great importance to physical exercise. He believes that proper exercise can help digestion, smooth qi and blood, not only prevent diseases, but also prolong life. That's the truth. On this basis, he imitated the movements of tigers, deer, bears, apes and birds, and created the "Five Birds Play". His disciple, Upp, insisted on practicing in this way. When he was over 90 years old, he could still hear and see, and his teeth were strong.
Cao Cao, the prime minister of the Han Dynasty, suffered from a headache due to head wind, but his long-term treatment failed, so he called Hua Tuo for treatment. Hua Tuo gave acupuncture, and the headache went away immediately. Cao Cao wanted to keep Hua tuo as a doctor, but Hua tuo didn't want to serve him alone, so he didn't go home under the pretext. Cao Cao was furious and killed Hua Tuo. ?
2. A short story about Hua Tuo:
(1) Psychotherapy
Hua tuo is good at using psychotherapy to treat diseases. There was a county magistrate who was very ill. Hua Tuo went to see him. The county magistrate asked Hua tuo to treat him. Hua Tuo said to the son of the county magistrate, "Your father's illness is different from other diseases. There is blood stasis in his stomach. You must provoke him to vomit, so as to cure his illness, or he will die. " Can you tell me all the wrong things your father usually does? I wrote a letter scolding him. "The sheriff's son said," If you can cure your father's illness, what can't you say? "
So he told Hua Tuo all the unreasonable things his father had done for a long time. Hua Tuo wrote a letter denouncing the chief. When the leader read the letter, he was furious and sent officials to arrest Hua Tuo. When he didn't catch him, the chief was furious and spit out more than a liter of black blood, and his illness was cured.
(2), dog leg cure sore
There is a beautiful girl who has been married for a long time, but she is not married yet, because her right knee has been sore for a long time and she keeps pouring strong water out. After Hua Tuo saw it, his father asked his daughter about her illness. Hua Tuo said, "Send someone to ride a horse to lead a chestnut dog for thirty miles. When I came back, I cut off the dog's right foot while the dog was hot and leaned against the sore. " After a while, a small red snake emerged from the sore and got into the foot of the dog. The girl recovered.
(3), spear into the wine
At the end of the later Han Dynasty, someone had a lump in his stomach, which was extremely painful day and night. When he died, he said to his son, "After I die, I can take it out by caesarean section and see what it is." His son couldn't bear to disobey his father's orders, so he took out a copper spear head by caesarean section, which was about a third of a liter. When Hua Tuo heard about it, he went to find out. After reading it, Hua Tuo took the medicine out of the small box and put it on the gun head, which immediately turned into wine.
(4) Paint green sticky powder
Hua tuo had many disciples in his life, and Peng Cheng, Fan A, Guangling and Xi Li Dangzhi were all famous all over the world. Upp wrote Upp's Materia Medica, Li Dang wrote Li Dang's Medical Records, and Fan Axi wrote Acupuncture. These three disciples later became famous doctors.
In his later years, in order to pass on his medical experience to future generations, Hua Tuo carefully wrote medical books, including Qingnangjing, Acupuncture in Pillow and many other works, but unfortunately they were all lost. Upp followed Hua Tuo's medical skills, and many people were cured and saved. Hua Tuo said to Upp: "The human body should exercise, but not excessively.
Shui Gu's qi can only be digested after exercise, and the blood circulation is smooth, so the disease will not happen. For example, the revolving door shaft will not rot. Therefore, people who used to cultivate immortals and monasteries often did exercises like "Qigong". They imitate bears climbing branches, owls turning their necks and looking around, stretching their waists and moving their joints to prolong their life.
Fan A is proficient in acupuncture therapy. All doctors say that the needle should not be inserted between the internal organs of the back and chest. Even if the needle is inserted, the depth should not exceed four minutes. Fan A's needle, however, is inserted one or two inches deep in the acupuncture point on the back and five or six inches in the Juque point on the chest, and the disease is often cured. Fan A asked Hua Tuo for a prescription that can be taken and beneficial to human body, and Hua Tuo taught him "Ye Qiqing Sticking Powder".
The prescription uses 1 liter of lacquer leaf crumbs and 14 liang of green sticky crumbs, which are prepared according to this ratio. It is said that taking this medicine for a long time can kill three kinds of parasites, benefit the five internal organs, make the body light and keep people's hair from turning white. Fan A did as he said and lived to be over one hundred years old.
References:
Baidu encyclopedia-Hua tuo biography