1. Department of Dermatology; Taipei Veterans General Hospital; Taipei Taiwan
2. Institute of Public Health; National Yang Ming University; Taipei Taiwan
3. Department of Public Health; National Yang Ming University; Taipei Taiwan
4. Department of Dermatology; Heping Fuyou Branch; Taipei City Hospital; Taipei Taiwan
5. Department of Education and Research; Taipei City Hospital; Taipei Taiwan
6. Institute of Hospital and Health Care Administration; National Yang Ming University; Taipei Taiwan
7. National Yang Ming University School of Medicine; Taipei Taiwan
8. Division of Gastroenterology; Department of Medicine; Taipei Veterans General Hospital; Taipei Taiwan