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. 2009 Aug 31;4(8):e6865. doi: 10.1371/journal.pone.0006865

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Bon et al.

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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EGFR serum levels decrease with increasing GOLD group in former smokers (p = 0.16) but do not significantly vary with severity of obstruction in current smokers (FS = former smoker, CS = current smoker).