Affiliation: | 1. Center for Dermatoepidemiology, VA Medical Center, Providence, RI, USA;2. Departments of Dermatology and Epidemiology, Brown University, Providence, RI, USA;3. Dermatology Service, San Francisco VA Medical Center, San Francisco, CA, USA;4. Department of Dermatology, University of California, San Francisco, CA, USA;5. VA Cooperative Studies Coordinating Center, Boston, MA, USA;6. Department of Dermatology, Rhode Island Hospital, Providence, RI, USA |