1. Department of Colorectal Surgery, The First Affiliated Hospital, Naval Medical University, Shanghai, 200433, China
2. Department of Gastroenterology, The First Affiliated Hospital, Naval Medical University, Shanghai, Shanghai, 200433, China
3. Department of Anorectal Surgery, Shuguang Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai, 201203, China
4. Anorectal Disease Institute of Shuguang Hospital, Shanghai, 201203, China