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Use propensity score matching on covariates

Open to legal residents of the 50 United States and the District of Columbia (excluding residents of Massachusetts, Michigan and Virginia), who are tobacco consumers, 21 & older

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Recoveries lower than 85 % indicate either an insufficient elution of B[a]P from the solid phase extraction cartridges or a change in response factor (RF) of the fluorescence detector

Suvremene strategije angamana samo pojaavaju taj uinak, irei granice interakcije