Institution: | 1.Department of Gastrointestinal Surgery,The First Affiliated Hospital, Chongqing Medical University,Chongqing,China;2.Department of Gastrointestinal Surgery,Nanchong Central Hospital,Nanchong,China;3.The Second Clinical School of North Sichuan Medical College,Nanchong,China;4.Department of Gastroenterology,The First Affiliated Hospital, Chongqing Medical University,Chongqing,China |