Affiliation: | 1. Department of Gastroenterology, Changhai Hospital, Naval Medical University, Shanghai, China;3. Shanghai Institute of Pancreatic Diseases, Shanghai, China;4. Department of Gastroenterology, 987th Hospital of the Joint Logistics Support Force of the People''s Liberation Army, Baoji, Shaanxi, China;6. Department of Health Statistics, Naval Medical University, Shanghai, China |