References: Benzodiazepine, zolpidem or zopiclone use in females of childbearing potential

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Olubodun JO, Ochs HR, Truten V, Klein A, von Moltke LL, Harmatz JS, et al. Zolpidem pharmacokinetic properties in young females: influence of smoking and oral contraceptive use. J Clin Pharmacol 2002;42(10):1142–6. https://www.ncbi.nlm.nih.gov/pubmed/12362929