1. First Clinical College of Chinese Medicine, Hunan University of Chinese Medicine, Changsha, Hunan 410208, P.R. China
2. Department of Proctology, The First Hospital of Hunan University of Chinese Medicine, Changsha, Hunan 410007, P.R. China
3. First Clinical College of Chinese Medicine, Hunan University of Chinese Medicine, Changsha, Hunan 410208, P.R. China
4. Department of Surgery and Male Disease, The First Hospital of Hunan University of Chinese Medicine, Changsha, Hunan 410007, P.R. China