1. Department of Spine Surgery and Orthopaedics, Xiangya Hospital Central South University Changsha China
2. National Clinical Research Center for Geriatric Disorders, Xiangya Hospital Central South University Changsha China
3. Department of Orthopedics, Ningde City Hospital Fujian Medical University Ningde China
4. Department of Medical Records & Information, Xiangya Hospital Central South University Changsha China