1. Department of Gastrointestinal Surgery; The Affiliated Hospital of North Sichuan Medical College; Nanchong Sichuan China
2. Institute of Hepatobiliary, Pancreatic and Intestinal Disease; North Sichuan Medical College; Nanchong Sichuan China
3. Department of Digestive Internal Medicine; The Affiliated Hospital of North Sichuan Medical College; Nanchong Sichuan China