1. Department of Family Medicine, Taipei Veterans General Hospital, Taipei, Taiwan.
2. National Yang-Ming University School of Medicine, Taipei, Taiwan.
3. Division of Family Medicine, Taipei Hospital, Department of Health, New Taipei City, Taiwan.
4. College of Healthcare Administration and Management, National Taipei University of Nursing and Health Sciences, Taipei, Taiwan.
5. Department of Dermatology, Heping Fuyou Branch, Taipei City Hospital, Taipei, Taiwan.
6. Institute of Public Health, National Yang-Ming University, Taipei, Taiwan.
7. Division of Gastroenterology, Department of Medicine, Taipei Veterans General Hospital, Taipei, Taiwan.