1 Corporal Michael J. Crescenz Veterans Affairs Medical Center, Philadelphia, Pennsylvania; Department of Dermatology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania.
2 Corporal Michael J. Crescenz Veterans Affairs Medical Center, Philadelphia, Pennsylvania; Department of Dermatology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania. Electronic address: werth@mail.med.upenn.edu.