1. Department of Orthopedics, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China (mainland)
2. Department of Orthopedic Surgery, Beijing Jishuitan Hospital, Fourth Clinical College of Peking University, Jishuitan Orthopaedic College of Tsinghua University, Beijing, China (mainland)
3. Department of Orthopedics, The Affiliated Hospital of Qingdao University, Qingdao, Shandong, China (mainland)