1. Department of Medicine and Therapeutics, Institute of Digestive Disease, Chinese University of Hong Kong, Hong Kong, China
2. Department of Medicine and Therapeutics, Division of Infectious Disease, Chinese University of Hong Kong, Hong Kong, China
3. Department of Medicine and Therapeutics, Division of Rheumatology, Chinese University of Hong Kong, Hong Kong, China
4. Department of Microbiology, Chinese University of Hong Kong, Hong Kong, China
5. Department of Radiology, Chinese University of Hong Kong, Hong Kong, China
6. Department of Gastroenterology and Hepatology, First Affliated Hospital, Sun Yat-Sen University, Guangzhou, China