1. Department of Health Sciences, University of Florence, Paediatric Infectious Diseases Division, Anna Meyer Children's University Hospital, Florence, Italy
2. Department of Health Sciences, Clinical Pharmacology and Oncology Section, University of Florence, Florence, Italy
3. National Head of the Dermatology Study Group of the Italian Federation of General Pediatricians, Rome, Italy;
4. Department of Biomedical and Biotechnological Sciences, University of Catania, Catania, Italy
5. Department of Medicine DIMED, University of Padua, Padua, Italy