Zhejiang University, Zhejiang University - Department of Gastroenterology, China Medical University - Shengjing Hospital, Wuhan University, Jilin University (JLU), Tongji University - Department of Gastroenterology, Xiamen University - Department of Gastroenterology, Ningxia Medical University - General Hospital, Guangxi Medical University - First Affiliated Hospital, Government of the People's Republic of China - Chinese PLA General Hospital, Central South University - Second Xiangya Hospital, Nanjing University - Nanjing Drum Tower Hospital, Government of the People's Republic of China - Department of Gastroenterology and Zhejiang University - Department of Gastroenterology