1. Department of Orthopedics SurgeryPeking Union Medical College HospitalChinese Academy of Medical Sciences and Peking Union Medical College Beijing China
2. Department of Medicine and TherapeuticsThe Chinese University of Hong Kong Hong Kong
3. Department of Anaesthesia and Intensive CareThe Chinese University of Hong Kong Hong Kong
4. State Key Laboratory of Digestive Disease and LKS Institute of Health SciencesThe Chinese University of Hong Kong Hong Kong