1 Corporal Michael J. Crescenz Veterans Affairs Medical Center, Philadelphia, Pennsylvania; Department of Dermatology, University of Pennsylvania, Philadelphia, Pennsylvania.
2 Department of Biostatistics, University of Pennsylvania, Philadelphia, Pennsylvania.
3 Department of Rheumatology, University of Pennsylvania, Philadelphia, Pennsylvania.
4 Department of Dermatology, University of Pennsylvania, Philadelphia, Pennsylvania.
5 Corporal Michael J. Crescenz Veterans Affairs Medical Center, Philadelphia, Pennsylvania; Department of Dermatology, University of Pennsylvania, Philadelphia, Pennsylvania. Electronic address: [email protected].