
https://www.bmj.com/content/371/bmj.m3966
Yland JJ, Bresnick KA, Hatch EE, Wesselink AK, Mikkelsen EM, Rothman KJ, Sørensen HT, Huybrechts KF, Wise LA. Pregravid contraceptive use and fecundability: prospective cohort study. BMJ. 2020 Nov 11;371:m3966. doi: 10.1136/bmj.m3966. PMID: 33177047; PMCID: PMC7656314.
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