1. Department of Geriatrics, Xiangya Hospital, Central South University, Changsha, Hunan Province 410008, PR China
2. Department of Nursing, Xiangya Hospital, Central South University, Changsha, Hunan Province 410008, PR China
3. Department of Oncology, Xiangya Hospital, Central South University, Changsha, Hunan Province 410008, PR China
4. National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, Hunan Province 410008, PR China