1. Allergy and Respiratory Diseases Clinic; University of Genoa; IRCCS-AOU San Martino; Genova; Italy
2. Epidemiology, Biostatistics and Clinical trials; National Cancer Research Institute; Genoa; Italy
3. Dipartimento Biomedico di Medicina Interna e Specialistica; University of Palermo; ‘Villa Sofia-Cervello’ Hospital; Palermo; Italy
4. Operative Immunoallergy Unit; A.O.U. Careggi; Florence; Italy
5. Pneumoallergology Unit; S. Orsola FBF Hospital; Brescia; Italy
6. Clinical Sciences; University of Parma; Parma; Italy
7. Allergy Unit; Respiratory Diseases Division; A.O.U. San Luigi; Torino; Italy
8. Respiratory Department; University Hospital; Messina; Italy
9. Allergy Service; Verona Major Hospital; Verona; Italy
10. Department of Dermatology and Allergy; Allergy Centre Charité; Charité-Universitätsmedizin Berlin; Berlin; Germany