1. Department of Dermatology; Peking Union Medical College Hospital; Chinese Academy of Medical Sciences and Peking Union Medical College; Beijing 100042 China
2. Department of Orthopaedic Surgery; Peking Union Medical College Hospital; Chinese Academy of Medical Science and Peking Union Medical College; Beijing 100730 China
3. Department of Anaesthesia and Intensive Care; The Chinese University of Hong Kong; Hong Kong 999077 China
4. State Key Laboratory of Digestive Disease; LKS Institute of Health Sciences; The Chinese University of Hong Kong; Hong Kong 999077 China