Chinese Academy of Medical Sciences & Peking Union Medical College (CAMS & PUMC) - Department of Endocrinology, Chinese Academy of Medical Sciences & Peking Union Medical College (CAMS & PUMC) - Department of Endocrinology, Chinese Center for Disease Control and Prevention (China CDC) - Division of Elderly Health, Chinese Academy of Medical Sciences & Peking Union Medical College (CAMS & PUMC) - Department of Radiology, Chinese Academy of Medical Sciences & Peking Union Medical College (CAMS & PUMC) - Medical Sciences Research Center, Government of the People's Republic of China - Department of Wound Repair and Rehabilitation Medicine, Chinese Center for Disease Control and Prevention (China CDC) - Division of Elderly Health, Nanjing University - Department of Orthopaedics, Chinese Center for Disease Control and Prevention (China CDC) - Division of Elderly Health, Chengdu Military General Hospital - Department of Endocrinology, Central South University - Hunan Provincial Key Laboratory of Metabolic Bone Diseases, Chinese Academy of Medical Sciences & Peking Union Medical College (CAMS & PUMC) - Department of Endocrinology, California Pacific Medical Center Research Institute - San Francisco Coordinating Center, Chinese Center for Disease Control and Prevention (China CDC) - National Center for Chronic Non-Communicable Disease Control and Prevention, Chinese Center for Disease Control and Prevention (China CDC) - National Center for Chronic and Noncommunicable Disease Control and Prevention and Chinese Academy of Medical Sciences & Peking Union Medical College (CAMS & PUMC) - Department of Endocrinology