1. Department of Gastroenterology, State Key Laboratory of Organ Failure Research, Nanfang Hospital, Southern Medical University, 510515 Guangzhou, Guangdong, China
2. Department of Pediatrics, The Sixth Affiliated Hospital, Sun Yat-sen University, 510655 Guangzhou, China
3. Department of Gastroenterology, Gastroenterology Endoscopy Center, Hainan General Hospital, Hainan Affiliated Hospital of Hainan Medical University, Haikou 570311, China