1. Department of Health Sciences, University of Florence, Italy
2. Italian Federation of Primary Care Pediatricians (FIMP), Genoa, Italy
3. Department of Biomedicine and Prevention, University of Rome Tor Vergata, Rome, Italy
4. Department of Medical Sciences, University of Ferrara, Ferrara, Italy
5. GSK, Verona, Italy
6. Department of Life, Health & Environmental Sciences, University of L’Aquila, L’Aquila, Italy
7. Department of Medical and Surgical Sciences, University of Foggia; Department of Hygiene, Policlinico Riuniti University Hospital of Foggia, Foggia, Italy
8. Family Pediatrician (FIMP Federazione Italiana Medici Pediatri), Greve in Chianti, FI, Italy
9. Department of Health Promotion, Maternal-Child Care, Internal Medicine and Medical Specialties, University of Palermo, Palermo, Italy