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References from Effect of collection time and reported cigarettes per day on exhaled carbon monoxide: a retrospective observational study. Local targets link to admitted publications; unresolved targets remain external evidence.
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10.1016/j.rmed.2003.11.018
10.1016/j.rmed.2003.11.018 · 2004 · External reference
10.1371/journal.pone.0028864
10.1371/journal.pone.0028864 · 2011 · External reference
10.1016/j.rmr.2009.09.004
10.1016/j.rmr.2009.09.004 · 2010 · External reference
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