1. Department of Orthopaedics, Xiangya Hospital, Central South University, #87 Xiangya Road, Changsha, Hunan, China
2. Department of Neurology, The Second Xiangya Hospital, Central South University, Changsha, Hunan, China
3. National Clinical Research Center of Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, Hunan, China.