1. Dermatology Clinic; University of Catania; A.O.U. Policlinico-Vittorio Emanuele; Via Santa Sofia 78-95123 Catania Italy
2. Department of Dermatology and Cutaneous Surgery; University of Miami Miller School of Medicine; 1600 N.W. 10th Avenue, RMSB, Room 2023-A, Miami, FL 33136 U.S.A