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 Orthopedic Surgery The General Hospital of Xingtai Mining Industry Bloc. Orthopaedic Hospital of Xingtai Xingtai China
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 Anaesthesia and Intensive Care The Chinese University of Hong Kong Hong Kong China
5. State Key Laboratory of Digestive Diseases Li Ka Shing Institute of Health Sciences The Chinese University of Hong Kong Hong Kong China