There should be no such person. I don't think this man can be trusted ... please see the title downstairs. The questioner is asking whether Yu Tong, an old Chinese doctor, is credible. Is there such an old Chinese doctor? I'm not asking if Chinese medicine can be trusted! No one is slandering Chinese medicine, it's just that you flatter yourself. You should review your Chinese well. Don't be so excited, it will delay the next generation.