DOI: 10.1055/s-00000009

American Journal of Perinatology

References

Owen J, Yost N, Berghella V. , et al; National Institute of Child Health and Human Development, Maternal-Fetal Medicine Units Network.
Mid-trimester endovaginal sonography in women at high risk for spontaneous preterm birth.

JAMA 2001;
286 (11) 1340-1348

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