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Snijders D, Daniels JM, de Graaff CS, van der Werf TS, Boersma WG.Snijders D, et al. Among authors: daniels jm.Am J Respir Crit Care Med. 2010 May 1;181(9):975-82. doi: 10.1164/rccm.200905-0808OC. Epub 2010 Feb 4.Am J Respir Crit Care Med. 2010.PMID: 20133929Clinical Trial.