1 Division of Dermatology, Department of Specialized, Experimental, and Diagnostic Medicine, S. Orsola-Malpighi Hospital, University of Bologna, Bologna, Italy bassi76@interfree.it.
2 Department of Health Sciences, University of Florence, and Department of IPaediatric Medicine, Anna Meyer Children s University Hospital, Florence, Italy.
3 Division of Dermatology, Department of Specialized, Experimental, and Diagnostic Medicine, S. Orsola-Malpighi Hospital, University of Bologna, Bologna, Italy.