1. Geriatric Institute, The General Hospital of Air Force, PLA, China
2. Chinese PLA (The Chinese People’s Liberation Army) Medical School, China
3. Shuguang Clinic Department of Rest Home for Retired Veterans, The PLA Air Force Beijing, China
4. Xijiao Clinic Department of Rest Home for Retired Veterans, The PLA Air Force Beijing, China
5. Department of Nursing, The General Hospital of PLA: 28 Fuxing Road, Haidian District, Beijing, China