%0 Journal Article %T Caffeine Concentrations in Coffee, Tea, Chocolate, and Energy Drink Flavored E-liquids %A Lisko, Joseph G. %A Lee, Grace E. %A Kimbrell, J. Brett %A Rybak, Michael E. %A Valentin-Blasini, Liza %A Watson, Clifford H. %J Nicotine and Tobacco Research %V 19 %N 4 %P 484-492 %@ 1462-2203 %D 2017-04-01 %I Oxford University Press %~ DeepDyve