1. Department of Gastroenterology and Hepatology National University Hospital Singapore
2. Department of Medicine Yong Loo Lin School of Medicine National University of Singapore Singapore
3. School of Medical Sciences Universiti Sains Malaysia Kota Bharu Malaysia
4. Division of Gastroenterology and Hepatology Department of Medicine Nihon University School of Medicine Tokyo Japan
5. Gastroenterology and Hepatology Veterans Affairs Medical Center Kansas CityUSA
6. Gastroenterology University of Kansas School of Medicine Kansas City USA