| Affiliation: | 1. Department of Gastroenterology, Daping Hospital, Army Medical University, Chongqing, China;2. Department of Gastroenterology, The 13th People's Hospital of Chongqing, Chongqing, China;3. Department of Gastroenterology, Lanzhou University Second Hospital, Lanzhou, China;4. Department of Gastroenterology, The Second People's Hospital of Chongqing, Chongqing, China;5. Department of Gastroenterology, Yongchuan Hospital Affiliated to Chongqing Medical University, Chongqing, China;6. Department of Gastroenterology, Wenzhou Central Hospital, Wenzhou, China |
