1 Department of Medicine, Chung Shan Medical University, Taichung, Taiwan; Division of Gastroenterology, Taichung Veterans General Hospital, Taichung, Taiwan.
2 Division of Gastroenterology, Taichung Veterans General Hospital, Taichung, Taiwan; Faculty of Medicine, School of Medicine, National Yang-Ming University, Taipei, Taiwan.
3 School of Medicine, Fu Jen Catholic University, New Taipei City, Taiwan.