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Comparison of Serum and Salivary Cotinine Measurements by a Sensitive High-Performance Liquid Chromatography-Tandem Mass Spectrometry Method as an Indicator of Exposure to Tobacco Smoke Among Smokers and Nonsmokers*

Comparison of Serum and Salivary Cotinine Measurements by a Sensitive High-Performance Liquid Chromatography-Tandem Mass Spectrometry Method as an Indicator of Exposure to Tobacco Smoke Among Smokers and Nonsmokers* — Distribution of the number of citations over years.

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