1. Division of Gastroenterology, Department of Medicine, Faculty of Medicine; Chulalongkorn University and King Chulalongkorn Memorial Hospital; Bangkok Thailand
2. Department of Internal medicine; University of Hawaii; Honolulu Hawaii USA
3. Division of Gastroenterology and Hepatology; Mayo Clinic; Rochester Minnesota USA
4. Department of Radiology, Faculty of Medicine; Chulalongkorn University and King Chulalongkorn Memorial Hospital; Bangkok Thailand
5. Department of Medicine; The University of Minnesota; Minneapolis Minnesota USA