Affiliation: | 1. Division of Pediatrics, Section of Dermatology, The Children''s Hospital of Philadelphia, Philadelphia, Pennsylvania;2. Department of Dermatology, Nationwide Children''s Hospital, Columbus, Ohio;3. Division of Dermatology, University of California Los Angeles, Los Angeles, California;4. Biostatistics and Data Management, The Children''s Hospital of Philadelphia, Philadelphia, Pennsylvania;5. University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania |