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Represas-Represas C, Fernández-Villar A, Ruano-Raviña A, Priegue-Carrera A, Botana-Rial M; study group of “Validity of COPD-6 in non-specialized healthcare settings”.Represas-Represas C, et al.PLoS One. 2016 Jan 4;11(1):e0145571. doi: 10.1371/journal.pone.0145571. eCollection 2016.PLoS One. 2016.PMID: 26726887Free PMC article.