1. Departments of Dermatology, University of Pennsylvania Perelman School of Medicine, Philadelphia2Epidemiology and Biostatistics, Center for Clinical Epidemiology and Biostatistics, University of Pennsylvania Perelman School of Medicine, Philadelphia
2. Departments of Dermatology, University of Pennsylvania Perelman School of Medicine, Philadelphia
3. Epidemiology and Biostatistics, Center for Clinical Epidemiology and Biostatistics, University of Pennsylvania Perelman School of Medicine, Philadelphia3Department of Rheumatology, University of Pennsylvania Perelman School of Medicine, Philadelphia