1. National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, Maryland
2. University of Arizona College of Medicine at South Campus, Tucson
3. Chevy Chase Dermatology Associates, Chevy Chase, Maryland
4. Department of Dermatology, George Washington Hospital, Washington, DC
5. DermAssociates, Silver Spring, Maryland
6. Department of Radiology and Imaging Sciences, National Institutes of Health Clinical Research Center, Bethesda, Maryland
7. Department of Dermatology, University of Pennsylvania, Philadelphia8The Center for Clinical Epidemiology and Biostatistics, University of Pennsylvania, Philadelphia