1. School of Nursing, Wenzhou Medical University, Wenzhou, Zhejiang, China
2. Geriatric Department, Ningbo Medical Center Lihuili Hospital, Ningbo, Zhejiang, China
3. School of Nursing, Peking University, Beijing, Beijing, China
4. Geriatric Department, the First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang, China