1. Department of Disease Control and Prevention, The First Medical Center of Chinese PLA General Hospital, Beijing 100853, China
2. Fuxing Road Outpatient Department, Jingnan Medical District of Chinese PLA General Hospital, Fuxing Road No. 22, Beijing 100842, China
3. First Department of Health Care, The Second Medical Center & National Clinical Research Center for Geriatric Diseases, Chinese PLA General Hospital, Beijing 100853, China
4. Department of Disease Control and Prevention, The Second Medical Center & National Clinical Research Center for Geriatric Diseases, Chinese PLA General Hospital, Beijing 100853, China