1. Dermatology Section, Department of Medical, Surgical and Neurological Science, University of Siena, S. Maria alle Scotte Hospital, Siena, Italy.
2. Department of Medical Biotechnology, University of Siena, Siena, Italy.
3. Allergological and Pediatric Dermatology Unit, Department of Health Sciences, University of Florence, Florence, Italy.
4. Unit of Dermatology, Livorno Hospital, Livorno, Italy.