1. Department of Orthopaedic Surgery Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College Beijing China
2. Department of Anaesthesia and Intensive Care, Faculty of Medicine The Chinese University of Hong Kong Hong Kong Hong Kong
3. Department of Orthopedic Surgery Beijing Jishuitan Hospital, Fourth Clinical College of Peking University, Jishuitan Orthopaedic College of Tsinghua University Beijing China
4. Department of Orthopedics The Affiliated Hospital of Qingdao University Qingdao China
5. State Key Laboratory of Digestive Diseases, Faculty of Medicine Institute of Digestive Diseases and LKS Institute of Health Sciences, The Chinese University of Hong Kong Hong Kong Hong Kong