[1] Univ Perugia, Dept Occupat Med, I-06121 Perugia, Italy
[2] Univ Strasbourg, Univ Hosp Strasbourg, Div Asthma & Allergy, Dept Chest Dis, Strasbourg, France
[3] Univ Perugia, Terni Hosp, Dept Occupat Med, I-06121 Perugia, Italy
[4] Sci Inst Pavia, Inst Care & Res, Allergy & Immunol Unit, Fdn Salvatore Maugeri, Pavia, Italy
[5] Univ Hosp Verona, Unit Occupat Med, Verona, Italy
[6] Hosp La Paz Inst Hlth Res IdiPAZ, Dept Allergy, Madrid, Spain
[7] CIBER Resp Dis CIBERES, Madrid, Spain
[8] Inst Ruhr Univ Bochum, German Social Accid Insurance, Inst Prevent & Occupat Med, Bochum, Germany
[9] Ciberes, CIBER Enfermedades Resp, Dept Allergy, Madrid, Spain
[10] Fdn Jimenez Diaz, E-28040 Madrid, Spain
[11] Toronto Western Hosp, Toronto, ON M5T 2S8, Canada
[12] Nofer, Inst Occupat Med, Lodz, Poland
[13] Ctr Res Environm Epidemiol CREAL, Barcelona, Spain
[14] Hosp Mar Med Res Inst IMIM, Barcelona, Spain
[15] CIBER Epidemiol & Salud Publ CIBERES, Barcelona, Spain