1. Department of Medicine, Dermatology Service, and
2. Department of Epidemiology and Biostatistics, Memorial Sloan-Kettering Cancer Center, New York, New York;
3. Dermatoepidemiology Unit, VA Medical Center Providence, Providence, Rhode Island;
4. Department of Dermatology, Rhode Island Hospital, Providence, Rhode Island;
5. Departments of Dermatology and Epidemiology, Brown University, Providence, Rhode Island;
6. Division of Epidemiology and Biostatistics, University of New Mexico, Albuquerque, New Mexico; and
7. Society, Human Development, and Health, Harvard School of Public Health, Boston, Massachusetts