1. National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, People’s Republic of China
2. Department of Spine Surgery, Xiangya Hospital, Central South University, Changsha, People’s Republic of China
3. National Center for Chronic and Noncommunicable Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing, People’s Republic of China
4. Department of Epidemiology and Health Statistics, Xiangya School of Public Health, Central South University, Changsha, People’s Republic of China