DOI:
10.1055/s-00000009
American Journal of Perinatology
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References
Ventura SJ, Curtin SC, Abma JC, Henshaw SK.
Estimated pregnancy rates and rates of pregnancy outcomes for the United States, 1990–2008. National vital statistics reports: From the centers for disease control and prevention, National Center for Health Statistics.
Natl Vital Stat Syst 2012;
60 (07) 1-21
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