1. Division of Gastroenterology, Department of Internal Medicine, Cathay General Hospital, Taipei 10650, Taiwan
2. School of Medicine, Fu-Jen Catholic University, New Taipei City 24205, Taiwan
3. Division of Gastroenterology, Department of Internal Medicine, Hsinchu Cathay General Hospital, No. 678, Section 2, Junghua Road, Hsinchu 30060, Taiwan
4. School of Medicine, College of Medicine, Taipei Medical University, Taipei 11031, Taiwan