1. Unit of Otolaryngology, Department of General Surgery and Medical-Surgical Specialties, University of Catania, Catania, Italy
2. UOSD Video-Endoscopia Delle Vas, P.O. San Gennaro, ASL Napoli 1 - Centro, Naples, Italy
3. Allergy Clinic, Casa di Cura Villa Montallegro, Genoa, Italy