1. Department of Woman, Child and of General and Specialized Surgery, Università degli Studi della Campania “Luigi Vanvitelli”, 80138 Naples, Italy
2. Paediatric Rheumatology Unit, Meyer Children’s Hospital IRCCS, 50139 Florence, Italy
3. Department of Paediatric Medicine, Meyer Children’s Hospital IRCCS, Cystic Fibrosis Regional Reference Centre, 50139 Florence, Italy