1. Corporal Michael J. Crescenz VA Medical Center; Philadelphia PA U.S.A
2. Department of Dermatology; Perelman School of Medicine; University of Pennsylvania; 3400 Civic Center Boulevard Philadelphia PA 19104 U.S.A
3. Department of Dermatology; Gil Medical Center; Gachon University College of Medicine; Incheon Korea
4. Department of Surgery and Translational Medicine; Section of Dermatology; University of Florence; Florence Italy