1. Department of Pediatrics, Pediatric Clinic, Fondazione IRCCS Policlinico San Matteo, University of Pavia, Pavia, Italy.
2. Pediatric Allergy Center, Istituto Giannina Gaslini, Genoa, Italy.
3. Allergy Clinic, Casa di Cura Villa Montallegro, Genoa, Italy.