%0 Journal Article %T Biomarkers of Exposure Among “Dual Users” of Tobacco Cigarettes and Electronic Cigarettes in Canada %A Czoli, Christine, D %A Fong, Geoffrey, T %A Goniewicz, Maciej, L %A Hammond,, David %J Nicotine and Tobacco Research %V 21 %N 9 %@ 1462-2203 %D 2019-08-19 %I Oxford University Press %~ DeepDyve