1. Department of Dermatology, Perelman School of Medicine, University of Pennsylvania, Philadelphia
2. Department of Biostatistics, Epidemiology and Informatics, Perelman School of Medicine, University of Pennsylvania, Philadelphia
3. Division of Pediatrics, Section of Dermatology, The Children’s Hospital of Philadelphia, Philadelphia, Pennsylvania
4. Department of Pediatrics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania