1. Division of Gastroenterology, Department of Medicine, Faculty of Medicine Chulalongkorn University Bangkok Thailand
2. Ma Har Myaing Hospital Yangon Myanmar
3. Division of Diagnostic Radiology, Department of Radiology, Faculty of Medicine Chulalongkorn University, King Chulalongkorn Memorial Hospital Bangkok Thailand
4. Center of Excellence for Innovation and Endoscopy in Gastrointestinal Oncology, Faculty of Medicine Chulalongkorn University Bangkok Thailand