DOI:
10.1055/s-00000009
American Journal of Perinatology
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References
Osterman MJK, Martin JA.
Timing and adequacy of prenatal care in the United States, 2015.
National Vital Statistics Reports. May 30, 2018. Volume 67. No 3. Accessed June 25, 2019 at:
https://www.cdc.gov/nchs/data/nvsr/nvsr67/nvsr67_03.pdf
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