1 Section of Dermatology, Department of Medical, Surgical and Neurological Science, S. Maria alle Scotte Hospital, University of Siena, Siena, Italy - file.russo@libero.it.
2 Section of Pathology, Department of Medical Biotechnology, University of Siena, Siena, Italy.
3 Section of Dermatology, Department of Medical, Surgical and Neurological Science, S. Maria alle Scotte Hospital, University of Siena, Siena, Italy.