1. Department of Public Health, College of Public Health, and Department of Medicine, College of Medicine, China Medical University, Taichung, Taiwan
2. Department of Family Medicine, China Medical University Hospital, Taichung, Taiwan
3. College of Medicine, Tzu Chi University, Hualien, Taiwan
4. Division of Hepatogastroenterology, Department of Internal Medicine, Taichung Tzu Chi Hospital, Taichung, Taiwan