[1] Univ Bari, Giovanni Pediat Hosp 23, Dept Pediat Allergy & Pulmonol, Bari, Italy
[2] Univ Bari, Azienda Osped Univ Policlin, Hyg Sect, Dept Biomed Sci & Human Oncol, Bari, Italy
[3] Univ Milan, Fdn IRCCS Ca Granda Osped Maggiore Policlin, Dept Pathophysiol & Transplantat, Pediat Clin 1, Milan, Italy