1. Department of Gastroenterology, The Second Affiliated Hospital, Guangzhou University of Chinese Medicine, Guangzhou, Guangdong 510120, P.R. China
2. Pharmaceutical Research Institute, Hunan Academy of Chinese Medicine, Changsha, Hunan 410013, P.R. China
3. Institute of Gastroenterology, Guangzhou University of Chinese Medicine, Guangzhou, Guangdong 510405, P.R. China
4. Academy of Chinese Medical Sciences, The Second Affiliated Hospital, Guangzhou University of Chinese Medicine, Guangzhou, Guangdong 510006, P.R. China