[1] Univ Parma, Dept Med & Surg, Clin Pediat Unit, Parma, Italy
[2] Univ Athens, Univ Gen Hosp Attikon, Sch Med, Dept Pediat 3,Pediat Allergy Unit, Athens, Greece
[3] Univ Athens, Univ Gen Hosp Attikon, Sch Med, Dept Pediat 3,Pulmonol Unit, Athens, Greece
[4] Univ Murcia, Hosp Univ Virgen Arrixaca, IMIB Arrixaca Biohlth Res Inst, Pediat Allergy Unit, Murcia, Spain
[5] Univ Murcia, Hosp Univ Virgen Arrixaca, IMIB Arrixaca Biohlth Res Inst, Pulmonol Unit, Murcia, Spain