1. Respiratory Allergy, Department of Medicine, IRCCS - Azienda Ospedaliera Universitaria San Martino-IST, Genoa, Italy
2. Pediatric Pneumology and Allergy Unit and Cystic Fibrosis Center, IRCCS Istituto Giannina Gaslini, Genoa, Italy
3. Department of Clinical and Biological Sciences, University of Torino, Turin, Italy