1. Department of Gastroenterology, Xiangya Hospital of Central South University , Changsha, Hunan , China
2. Hunan International Scientific and Technological Cooperation Base of Artificial Intelligence Computer Aided Diagnosis and Treatment for Digestive Disease , Changsha, Hunan , China
3. National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University , Changsha, Hunan , China