I. M. Fearon, M. Nides, A. Eldridge, O. M. Camacho, J. Murphy, and C. J. Proctor, “A pharmacokinetic study to examine nicotine delivery from e cigarettes and a conventional cigarette in healthy subjects during a brief period of ad libitum use”, Int J Clin Trials, vol. 4, no. 4, pp. 131–138, Oct. 2017.