1 Department of Dermatology, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania. Electronic address: john.barbieri@pennmedicine.upenn.edu.
2 Department of Dermatology, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania.
3 Department of Dermatology, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania; Center for Clinical Epidemiology and Biostatistics, Department of Biostatistics, Epidemiology and Informatics, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania.