1. Department of Gastroenterology 925th Hospital of PLA Joint Logistics Support Force Guiyang China
2. Department of Immunology and Microbiology GuiZhou University of Traditional Chinese Medicine Guiyang Guizhou China
3. Department of Geriatrics Zhongnan Hospital of Wuhan University Wuhan China
4. Department of Epidemiology and Biostatistics Empower U, X&Y solutions Inc. Boston USA
5. Department of Geriatrics, Union Hospital, Tongji Medical College Huazhong University of Science and Technology Wuhan China
6. Department of Geriatrics, Tongji Hospital, Tongji Medical College Huazhong University of Science and Technology Wuhan China
7. Department of Gastroenterology 923th Hospital of PLA Joint Logistics Support Force Nanning China