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Taylor B, Mannino D, Brown C, Crocker D, Twum-Baah N, Holguin F.Taylor B, et al. Among authors: holguin f.Thorax. 2008 Jan;63(1):14-20. doi: 10.1136/thx.2007.082784.Thorax. 2008.PMID: 18156567
Mannino DM, Thorn D, Swensen A, Holguin F.Mannino DM, et al. Among authors: holguin f.Eur Respir J. 2008 Oct;32(4):962-9. doi: 10.1183/09031936.00012408. Epub 2008 Jun 25.Eur Respir J. 2008.PMID: 18579551Free article.