[1] Hosp Univ Gran Canaria Dr Negrin, Pulm Dept, Canary Islands, Spain
[2] Hosp Univ Gran Canaria Dr Negrin, Invest Unit, Canary Islands, Spain
[3] Hosp Univ Gran Canaria Dr Negrin, Hematol Dept, Canary Islands, Spain
[4] Hosp Univ Nuestra Senora Candelaria, Invest Unit, Canary Islands, Spain
[5] Harvard Med Sch, Dept Pulm, Brigham & Womens Hosp, Boston, MA USA
[6] Hosp Univ Nuestra Senora Candelaria, Pulm Dept, Canary Islands, Spain