[1] Univ Naples Federico II, Reg Cyst Fibrosis Ctr, Dept Translat Med Sci, Pediat Unit, Naples, Italy
[2] Dept Pediat Resp Endoscopy & Difficult Airways Ma, Naples, Italy
[3] Univ Brescia, Cyst Fibrosis Support Ctr, Paediat Dept, ASST Spedali Civili Brescia, Brescia, Italy
[4] ASST Spedali Civili Brescia, Unit Pediat Otorhinolaryngol, Brescia, Italy
[5] Univ Brescia, Angelo Nocivelli Inst Mol Med, Dept Mol & Translat Med, Brescia, Italy
[6] Freelance Epidemiologist, Bergamo, Italy
[7] Univ Naples Federico II, Reg Cyst Fibrosis Ctr, Dept Translat Med Sci, Pediat Unit, Via Pansini 5, I-80131 Naples, Italy