1. Department of Gastroenterology, The Affiliated Hospital of Yangzhou University, No. 368 Hanjiang Middle Road, Yangzhou 225001, China
2. Department of Emergency, The Affiliated Suqian Hospital of Xuzhou Medical University, Suqian 223800, China
3. Department of Gastroenterology, Wuzhong People’s Hospital of Suzhou, Suzhou 215000, China
4. Department of Epidemiology, Center for Global Health, School of Public Health, Nanjing Medical University, Nanjing 211166, China