1. Department of Gastroenterology and Hepatology; Chang Gung Memorial Hospital at Linkou; Chang Gung University College of Medicine; Taoyuan Taiwan
2. Division of Gastroenterology; Buddhist Tzu Chi General Hospital; Taipei Branch and School of Medicine; Tzu Chi University; Hualien Taiwan
3. Division of Gastroenterology and Hepatology; Department of Medicine; Chang Gung Memorial Hospital at Keelung; Taiwan