This is hard to say. It depends on where you are. From a national perspective, teachers in Beijing are definitely good at teaching. Anti-cancer paradise, research can. If you are in the Northeast, I recommend you to find Mr. Zhang Yankun. If you are in Shandong, you can find Mr. Zhao Jifeng. If you are in Shenzhen, Guangdong, you can find Mr. Sang in Beijing. He is a researcher, but he often teaches there. If you are in Shanghai, you can find the Cancer Club. There is Mr. Tao Rong in Shanghai (021-51187768). If you are in Guilin, you can find Mr. Tang Liling (a disciple of Mr. Guo Lin) of the Anti-Cancer Association. There are many more. The key is where you are. The most authentic is to find a disciple handed down by Guo Lin, the capital.