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