1 NHC Key Laboratory of Digestive Diseases, Division of Gastroenterology and Hepatology, Renji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, China.
2 NHC Key Laboratory of Digestive Diseases, Division of Gastroenterology and Hepatology, Renji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, China. Electronic address: sundanfeng@renji.com.