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. 2021 Sep 9;6(9):e005856. doi: 10.1136/bmjgh-2021-005856

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© Author(s) (or their employer(s)) 2021. Re-use permitted under CC BY. Published by BMJ.

This is an open access article distributed in accordance with the Creative Commons Attribution 4.0 Unported (CC BY 4.0) license, which permits others to copy, redistribute, remix, transform and build upon this work for any purpose, provided the original work is properly cited, a link to the licence is given, and indication of whether changes were made. See: https://creativecommons.org/licenses/by/4.0/.

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Selenium concentrations of Liverpool cohort (A) and the meta-analysis of maternal Se concentration associated with gestational duration (B). Se, selenium.