1. Center of Excellence in Digestive Diseases and Gastroenterology Unit, Department of Medicine Thammasat University Pathumthani Thailand
2. Department of Medicine Chulabhorn International College of Medicine (CICM) at Thammasat University Pathumthani Thailand
3. Division of Gastroentero‐Hepatology, Department of Internal Medicine, Faculty of Medicine Universitas Airlangga Surabaya Indonesia