S-Z Liu1, X Zhou1, Y-P Wang1, Y Liu1, A Song2. 1. Department of Orthopaedic Surgery, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, 1 Shuaifu Yuan, Beijing, 100730, China. 2. Department of Endocrinology, Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Sciences, 1 Shuaifu Yuan, Beijing, 100730, China.