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for serum vitamin B12 levels, the concentration ranges of the four groups were: quartile 1 ( 588 pg/mL)

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How nicotine travels in smoke When tobacco or another plant material burns, it produces smoke that contains many chemicals

Testing the validity of the method with respect to age While the WHO mortality data are by 5 year age group, the epidemiological data are typically for the whole age range considered, though for some studies estimates are available for less broad age ranges