I Neri1, A Bassi2, A Virdi3, C Gurioli3, A Patrizi3. 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.