1 Unit of Dermatology, Department of Specialized, Diagnostic and Experimental Medicine, University of Bologna, Bologna, Italy - alessandro.traniello@gmail.com.
2 Unit of Dermatology, Department of Specialized, Diagnostic and Experimental Medicine, University of Bologna, Bologna, Italy.
3 Unit of Dermatology, Department of Specialized, Diagnostic and Experimental Medicine, University of Pavia, Pavia, Italy.