They were extracted with 10 mL of HPLC-grade acetonitrile which was spiked with 900 L of a 2.03 mM solution of 1,2,3,4-tetrachlorobenzene (Sigma-Aldrich), used as an internal standard to account for losses in the extraction process (6070% yield)
Longitudinal predictors of continued tobacco use among patients diagnosed with cancer
The present study did not adjust for these sources of VOCs, making the current findings subject to confounding
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