Reference:
1. Bracken MB. Oral contraception and congenital malformations in offspring: a review and meta-analysis of the prospective studies. Obstet Gynecol 1990; 76:552-7.
2. Waller DK, Gallaway MS, Taylor LG, Ramadhani TA, Canfield MA, Scheuerle A, et al. Use of oral contraceptives in pregnancy and major structural birth defects in offspring. Epidemiology 2010; 21:232-9.
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