1. Anorectal Department, Yinchuan Traditional Chinese Medicine Hospital, Ningxia Medical University, Yinchuan, Ningxia Hui Autonomous Region 750001, P.R. China
2. Key Laboratory of Chinese Internal Medicine of Ministry of Education and Beijing, Dongzhimen Hospital, Beijing University of Chinese Medicine, Beijing 100700, P.R. China
3. Oncology Department, Xiyuan Hospital, China Academy of Chinese Medical Sciences, Beijing 100091, P.R. China
4. Anorectal Department, Dongzhimen Hospital, Beijing University of Chinese Medicine, Beijing 100700, P.R. China