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Impact of preconception enrollment on birth enrollment and timing of exposure assessment in the initial vanguard cohort of the U.S. National Children’s Study

Crossref DOI link: https://doi.org/10.1186/s12874-015-0067-1

Published Online: 2015-09-24

Published Print: 2015-12

Update policy: https://doi.org/10.1007/springer_crossmark_policy

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