1. Department of Febrile Diseases, School of Chinese Medicine, Nanjing, Jiangsu 210023, P.R. China
2. Hanlin College, Nanjing University of Chinese Medicine, Nanjing, Jiangsu 210023, P.R. China
3. Digestive Department, Xiyuan Hospital, China Academy of Chinese Medicine Sciences, Beijing 100091, P.R. China