1. Division of Pediatrics, Department of Health Sciences, University of Piemonte Orientale, Novara, Italy
2. School of Pediatrics, University of Cagliari, Cagliari, Italy
3. Pediatric Unit, Department of Clinical-Surgical, Diagnostic and Pediatric Sciences, University of Pavia, Pavia, Italy
4. Pediatric Clinic, Fondazione IRCCS Policlinico San Matteo, Pavia,
Italy
5. Department of Clinical-Surgical, Diagnostic and Pediatric Science, University of Pavia, Pavia, Italy
6. Dermatology Clinic, Fondazione IRCCS Policlinico San Matteo, Pavia, Italy