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Blanco I, Gimeno E, Munoz PA, Pizarro S, Gistau C, Rodriguez-Roisin R, Roca J, Barberà JA.Blanco I, et al. Among authors: roca j.Am J Respir Crit Care Med. 2010 Feb 1;181(3):270-8. doi: 10.1164/rccm.200907-0988OC. Epub 2009 Oct 29.Am J Respir Crit Care Med. 2010.PMID: 19875684Clinical Trial.