1. Department of Gastroenterology, Zhongda Hospital Southeast University, Medical College of Southeast University, Nanjing, Jiangsu 210000, P.R. China
2. Department of General Surgery, Wuhu No. 1 People's Hospital, Wuhu, Anhui 241000, P.R. China
3. Department of Gastroenterology, Wuhu No. 1 People's Hospital, Wuhu, Anhui 241000, P.R. China