Mikkelsen EM, Riis AH, Wise LA, Hatch EE, Rothman KJ, Toft Sorensen H. Pre-gravid oral contraceptive use and time to pregnancy: a Danish prospective cohort study. Hum Reprod. 2013 May;28(5):1398-405.
DiBenedetti DB, Price MA, Andrews EB. Cognitive interviewing in risk minimization survey development: patient and healthcare professional surveys. Expert Rev Clin Pharmacol. 2013;6(4):369-73.