1. Department of Community and Family Medicine China Medical University Hospital Taichung Taiwan
2. Division of Gastroenterology and Hepatology Beth Israel Deaconess Medical Center Boston Massachusetts USA
3. Department of Social Medicine and Family Medicine, College of Medicine China Medical University Taichung Taiwan
4. Department of Family Medicine National Taiwan University Hospital Taipei Taiwan
5. Department of Family Medicine National Taiwan University Hospital Bei‐Hu Branch Taipei Taiwan
6. Community and Geriatric Medicine Research Center National Taiwan University Hospital Bei‐Hu Branch Taipei Taiwan