[1] Hosp Galdakao, Serv Neumol, Galdakao, Spain
[2] Red Invest Serv Sanitarios & Enfermedades Cronica, Barcelona, Spain
[3] BioCrues Bizkaia Hlth Res Inst, Baracaldo, Spain
[4] Hosp Galdakao, Unidad Invest, Galdakao, Spain
[5] Kronikgune Res Inst, Baracaldo, Spain
[6] Hosp Cruces, Serv Neumol, Baracaldo, Spain
[7] Organ Sanitaria Integrada Barrualde, Atenc Primaria, Galdakao, Spain
[8] OSI Alto Deba, Clin Management Unit, Alto Deba, Spain
[9] Biodonostia Hlth Res Inst, Donostia San Sebastian, Spain