[1] Univ Barcelona, Dept Pneumol & Resp Allergy, Hosp Clin, E-08036 Barcelona, Spain
[2] Inst Invest Biomed August Pi i Sunyer IDIBAPS, Barcelona, Spain
[3] Ctr Invest Biomed Red Enfermedades Resp CIBERES, Palma De Mallorca, Spain
[4] Hosp Xeral Calde, Dept Pneumol, Lugo, Spain
[5] Hosp Gen Mataro, Dept Pneumol, Mataro, Spain
[6] Hosp del Mar IMIM, Dept Pneumol, Barcelona, Spain
[7] Hosp Univ Canarias, Dept Pneumol, San Cristobal Laguna, Spain
[8] Hosp Sagunto, Dept Pneumol, Valencia, Spain
[9] Hosp Univ M Servet, Dept Pneumol, Zaragoza, Spain
[10] Hosp Univ V del Rocio, Dept Pneumol, Seville, Spain
[11] Hosp Univ Reina Sofia, Dept Pneumol, Cordoba, Spain
[12] Hosp Costa Sol, Dept Pneumol, Marbella, Spain
[13] Hosp Manacor, Dept Pneumol, Manacor, Spain