Letter

Use of serum cotinine to assess the accuracy of self reported non-smoking.

Br Med J (Clin Res Ed) 1986; 293 doi: https://doi.org/10.1136/bmj.293.6557.1306-b (Published 15 November 1986) Cite this as: Br Med J (Clin Res Ed) 1986;293:1306

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