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Description of the study cohort with prenatal care and delivery information entered into the ZEPRS from June 1, 2007, to January 31, 2010. * The 38 893 pregnancies with no delivery information after 44 weeks represent non-institutional delivery, institutional delivery outside the ZEPRS-supported sites, and losses to follow-up. All gestational ages are based on dating information at the enrollment visit. EGA, estimated gestational age.
