DOI: 10.1055/s-00000009

American Journal of Perinatology

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References

R Core Team.
R: a language and environment for statistical computing.
R Foundation for Statistical Computing;
Vienna, Austria: 2018. . Accessed February 10, 2015 at:
https://www.gbif.org/tool/81287/r-a-language-and-environment-for-statistical-computing

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