1. Channing Division of Network Medicine; Brigham and Women's Hospital and Harvard Medical School; Boston MA
2. Department of Family Medicine; Seoul National University College of Medicine; Seoul Korea
3. Department of Biomedical Sciences; Seoul National University College of Medicine; Seoul Korea
4. Department of Dermatology; The Warren Alpert Medical School, Brown University; Providence RI
5. Department of Occupational and Environmental Health Sciences, School of Public Health; Peking University; Beijing China
6. Department of Epidemiology; Brown University School of Public Health; Providence RI
7. Department of Veterans Affairs Medical Center; Center for Dermatoepidemiology; Providence RI
8. Department of Dermatology; Rhode Island Hospital; Providence RI