[1] Univ Santiago Compostela, Dept Med Prevent & Salud Publ, La Coruna, Spain
[2] CIBERESP, Barcelona, Spain
[3] Complejo Hosp Alvaro Cunqueiro, Serv Neumol, Vigo, Pontevedra, Spain
[4] Hosp Puerta de Hierro, Serv Oncol, Madrid, Spain
[5] Inst Invest Puerta Hierro, Madrid, Spain