1. Center for Inflammatory Bowel Disease Research, the Shanghai Tenth People's Hospital, Tongji University School of Medicine, Shanghai 200072, China
2. Department of Gastroenterology, the First People's Hospital of Shangqiu City Affiliated to Xinxiang Medical University, Shangqiu 476100, China
3. Department of Gastroenterology, Affiliated Hospital of Putian University, Putian 351106, China