Department of Gastroenterology, The First Affiliated Hospital,College of Medicine, Zhejiang University, Hangzhou 310003,Zhejiang Province, China
Department of Gastroenterology, Ningbo Branch Hospital of the First Affiliated Hospital, College of Medicine, Zhejiang University, Ningbo 315100, Zhejiang Province, China
Department of Colon and Rectal Surgery, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou 310003, Zhejang Province, China