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Pérez-de-Llano LA, Carballada F, Castro Añón O, Pizarro M, Golpe R, Baloira A, Vázquez Caruncho M, Boquete M.Pérez-de-Llano LA, et al.Eur Respir J. 2010 Jun;35(6):1221-7. doi: 10.1183/09031936.00118809. Epub 2009 Dec 8.Eur Respir J. 2010.PMID: 19996191Free article.Clinical Trial.