1. Department of Medicine, Hualien Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation and Tzu Chi University, Hualien, Taiwan
2. College of Medicine and Public Health Flinders University, Adelaide, Australia
3. Department of Medical Research, Hualien Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation, Hualien, Taiwan
4. Division of Gastroenterology, Washington University School of Medicine, St Louis, MO, USA
5. Institute of Medical Sciences, Tzu Chi University, Hualien, Taiwan