1. Department of General Practice, Sir Run Run Shaw Hospital, Zhejiang University, Hangzhou, Zhejiang 310000, China
2. Institute of Gastroenterology, Zhejiang University, Hangzhou, Zhejiang 310000, China
3. Department of Gastroenterology, Sir Run Run Shaw Hospital, Zhejiang University, Hangzhou, Zhejiang 310000, China
4. Department of Gastroenterology, Second Affiliated Hospital, Zhejiang University, Hangzhou, Zhejiang 310000, China