1 Department of Gastroenterology, the First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China; Zhejiang Provincial Clinical Research Center for Digestive Diseases, Hangzhou, China; Department of Gastroenterology, Ningbo First Hospital, Ningbo, China.
2 Department of Gastroenterology, the First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China; Zhejiang Provincial Clinical Research Center for Digestive Diseases, Hangzhou, China; Department of Gastroenterology, Haining Branch of the First Affiliated Hospital, Zhejiang University School of Medicine, Haining, China.
3 Department of Gastroenterology, the First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China; Zhejiang Provincial Clinical Research Center for Digestive Diseases, Hangzhou, China.
4 Department of Gastroenterology, the First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China; Zhejiang Provincial Clinical Research Center for Digestive Diseases, Hangzhou, China; Department of Gastroenterology, Haining Branch of the First Affiliated Hospital, Zhejiang University School of Medicine, Haining, China. Electronic address: xiaofu@zju.edu.cn.