[1] Fdn Salvatore Maugeri, Serv Allergol & Immunol Clin, IRCCS, Allergy & Immunol Unit,Inst Care & Res,Sci Inst P, I-27100 Pavia, Italy
[2] Univ Hosp Strasbourg, Div Asthma & Allergy, Dept Chest Dis, Strasbourg, France
[3] Univ Cagliari, Dept Med Sci M Aresu, Cagliari, Italy
[4] Univ Perugia, Dept Clin & Expt Med, Occupat Allergy Unit, Terni Hosp, I-06100 Perugia, Italy
[5] Univ Turin, ASO Mauriziano Umberto 1, Turin, Italy
[6] Univ Padua, Dept Environm Med & Publ Hlth, Padua, Italy
[7] Hosp La Paz IdiPAZ, Dept Allergy, Madrid, Spain
[8] CIBER Enfermedades Resp CIBERES, Madrid, Spain
[9] Fdn Jimenez Diaz, CIBER Enfermedades Resp, Ciberes, E-28040 Madrid, Spain
[10] Fdn Jimenez Diaz, Dept Allergy, E-28040 Madrid, Spain
[11] Univ Perugia, Dept Clin Expt Med, I-06100 Perugia, Italy
[12] Nofer Inst Occupat Med, Dept Occupat Dis, Lodz, Poland
[13] Erasmus MC, Sect Allergol, Dept Internal Med, Rotterdam, Netherlands