1. Department of Coloproctology, The Second Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang, China
2. Department of Gastrointestinal Surgery, Institute of Hepatobiliary, Pancreas and Intestinal Disease, The Affiliated Hospital of North Sichuan Medical College, Nanchong, Sichuan, China
3. Department of Coloproctology, Wenzhou Hospital of Integrated Traditional Chinese and Western Medicine, Wenzhou, Zhejiang, China