1 Department of Dermatology, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania; Corporal Michael J. Crescenz Veterans Affairs Medical Center, Philadelphia, Pennsylvania.
2 Department of Biostatistics, Epidemiology, and Informatics, University of Pennsylvania, Philadelphia, Pennsylvania.
3 Department of Dermatology, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania; Corporal Michael J. Crescenz Veterans Affairs Medical Center, Philadelphia, Pennsylvania. Electronic address: [email protected].