1. Division of Gastroenterology, Department of Medicine, Rajavithi hospital, Ministry of Public Health, College of Medicine Rangsit University Bangkok Thailand
2. Institute of Gastrosciences and Liver Transplant Apollo Multispecialty Hospitals Kolkata West Bengal India
3. Division of Gastroenterology and Hepatology, Department of Medicine and Therapeutics, Prince of Wales Hospital, Faculty of Medicine Chinese University of HongKong Hong Kong China