Meng Xue1, Wei-Hong Weng2, Liang-Jing Wang3. 1. Department of Gastroenterology, the Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang, China; Institute of Gastroenterology, Zhejiang University, Hangzhou, Zhejiang, China. 2. Department of General Surgery, the Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang, China. 3. Department of Gastroenterology, the Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang, China; Institute of Gastroenterology, Zhejiang University, Hangzhou, Zhejiang, China. Electronic address: wangljzju@zju.edu.cn.