[1] UAM, IIS Fdn Jimenez Diaz, Immunol, Madrid, Spain
[2] CIBERES, Ciber Enfermedades Resp, Madrid, Spain
[3] Fdn Jimenez Diaz, Madrid, Spain
[4] UAM, Epidemiol, IIS Fdn Jimenez Diaz, Madrid, Spain
[5] Hosp La Paz, Inst Hlth Res IdiPAZ, Madrid, Spain
[6] Hosp Univ Son Espases IdISBa, Dept Resp Med, Palma De Mallorca, Spain