1. UOSD Allergy and Immunology, IDI-IRCCS, Rome, Italy
2. Immunology and Allergy Unit, Santa Maria degli Angeli Hospital, Pordenone, Italy
3. Allergy Diseases Center "Prof. G. Bonsignore", Institute of Biomedicine and Molecular Immunology "A. Monroy"(IBIM)-National Research Council (CNR), Palermo, Italy
4. Allergy and Immunology Unit, Istituti Clinici Scientifici Maugeri, IRCCS Pavia and Division of Pulmonary Rehabilitation, Istituti Clinici Scientifici Maugeri, IRCCS Tradate, Italy
5. SOS Allergy and Clinical Immunology, Azienda Sanitaria USL Toscana Centro, Prato, Italy
6. Health services research unit, IDI-IRCCS, Rome, Italy
7. Ambulatorio di Allergologia, Clinica San Carlo, Paderno Dugnano (MI), Italy