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. 2021 May 11;11(5):e045074. doi: 10.1136/bmjopen-2020-045074

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© Author(s) (or their employer(s)) 2021. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.

This is an open access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited, appropriate credit is given, any changes made indicated, and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/.

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Assembly of the primary study cohort is demonstrated in this figure. The final study cohort was selected based on propensity score matching from the women who were potentially eligible and met selection criteria.