1. Department of Gastroenterology, The First Affiliated Hospital of Sun Yat-sen University, Guangzhou, China.
2. Department of Colorectal Surgery, The Sixth Affiliated Hospital of Sun Yat-sen University, Guangzhou, China.
3. Department of Medicine and Therapeutics, Institute of Digestive Disease, State Key Laboratory of Digestive Diseases, Chinese University of Hong Kong, Hong Kong, China.
4. Department of General Surgery, The First Affiliated Hospital of Sun Yat-sen University, Guangzhou, China.
5. IBD Service, Department of Gastroenterology, Sheba Medical Center & Sackler School of Medicine, Tel-Aviv University, Tel Hashomer, Israel.