| http://www.w3.org/ns/prov#value | - This study was a secondary analysis of data collected for a multicenter, prospective, observational cohort study originally conducted by the Maternal Fetal Medicine Units Network of the National Institute of Child Health and Human Development between October 1992 and July 1994.5 This deidentified dataset is available through the Eunice Kennedy Shriver National Institute of Child Health and Human D
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