1. Department of Human and Hereditary Pathology, Institute of Dermatology, University of Pavia and Foundation IRCCS Policlinico S. Matteo, Pavia, Italy
2. Department of Pediatric Sciences, University of Pavia and Foundation IRCCS Policlinico S. Matteo, Pavia, Italy
3. Clinical Epidemiology and Biometry Unit, University of Pavia and Foundation IRCCS Policlinico S. Matteo, Pavia, Italy