1. University of Pennsylvania Perelman School of Medicine, 14640, Biostatistics, Epidemiology and Informatics, Philadelphia, Pennsylvania, United States;
2. University of Pennsylvania Perelman School of Medicine, 14640, Dermatology, Philadelphia, Pennsylvania, United States;
3. University of Maryland School of Medicine, 12264, Baltimore, Maryland, United States;
4. University of Pennsylvania Perelman School of Medicine, 14640, Dermatology, 3400 Civic Center BLVD, Philadelphia, Pennsylvania, United States, 19104-5127;