BMJ : British medical journal
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Observational Study
Maternal use of oral contraceptives and risk of birth defects in Denmark: prospective, nationwide cohort study.
Is oral contraceptive use around the time of pregnancy onset associated with an increased risk of major birth defects? ⋯ BMC was funded by the Harvard T H Chan School of Public Health's Maternal Health Task Force and Department of Epidemiology Rose Traveling Fellowship; training grant T32HD060454 in reproductive, perinatal, and paediatric epidemiology and award F32HD084000 from the Eunice Kennedy Shriver National Institute of Child Health and Human Development; and grant T32CA09001 from the National Cancer Institute. The authors have no competing interests or additional data to share.