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Controlled terminology was developed for the test names of the majority of biomarkers used in Tobacco studies, including biomarkers of exposure or potential harm. 

The variables LBORNRLO, LBORNRHI, LBSTNRLO, LBSTNRHI, LBNRIND and LBLOBXFL are expected variables. but are typically not used in these types of studies. Hence are included in the datset but the values may be null. These variables are not included below to save space.  

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