1. Department of Gastroenterology, the First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang Province 310003, China
2. Department of Gastroenterology, Yiwu Fuyuan No. 1 Hospital, Yiwu, Zhejiang Province 322000, China
3. Department of Internal Medicine, Dongtou District People’s Hospital, Wenzhou, Zhejiang Province 325000, China
4. Department of Gastroenterology, Affiliated Hospital of Shaoxing University (Shaoxing Municipal Hospital), Shaoxing, Zhejiang Province 312000, China