1. Department of Surgery, Institute of Digestive Disease, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong
2. Department of Medicine and Therapeutics, Institute of Digestive Disease, State Key Laboratory of Digestive Disease, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong
3. School of Public Health and Primary Care, Faculty of Medicine, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong