[1] Univ Barcelona, Serv Pneumol, Hosp Clin Barcelona, IDIBAPS, Barcelona, Spain
[2] Univ Barcelona, Technol Innovat Unit, Hosp Clin Barcelona, IDIBAPS, Barcelona, Spain
[3] Univ Pompeu Fabra, Resp & Environm Hlth Res Unit, Inst Municipal Invest Med, Barcelona, Spain
[4] Univ Politecn Madrid, Grp Bioingn & Telemed, Madrid, Spain
[5] Katholieke Univ Leuven, Div Resp, Fac Kinesiol & Rehabil, Louvain, Belgium