1. Center of Clinical Laboratory, Hainan Branch of Chinese PLA General Hospital, Sanya, China
2. Department of Clinical Microbiology, Chinese PLA General Hospital, Beijing, China
3. Medical Records Management Section of Geriatric Ward, Chinese PLA General Hospital, Beijing, China
4. National Clinical Research Center for Geriatric Disease, Department of Geriatric Cardiology, Chinese PLA General Hospital, Beijing, China
5. Outpatient Comprehensive Treatment Area, Chinese PLA General Hospital, Beijing, China