[1] Univ Pavia, Dept Pediat, Fdn IRCCS Policlin San Matteo, Pavia, Italy
[2] CHU Montpellier, Unite Allergol, Dept Pneumol & Addictol, Hop Arnaud Villeneuve, Montpellier, France
[3] UPMC Paris 06, Sorbonne Univ, UMR S 1136, IPLESP,Equipe EPAR, F-75013 Paris, France
[4] Fdn IRCCS Policlin San Matteo, Dept Radiol, Pavia, Italy
[5] Univ Padua, Womens & Childrens Hlth Dept, Unit Resp Med & Allergy, Padua, Italy
[6] Univ Padua, Pathol Anat Sect, Dept Cardiothorac & Vasc Sci, Padua, Italy