DOI: 10.1055/s-00000009

American Journal of Perinatology

References

Fonseca EB, Celik E, Parra M, Singh M, Nicolaides KH. Fetal Medicine Foundation Second Trimester Screening Group.
Progesterone and the risk of preterm birth among women with a short cervix 
N Engl J Med 2007; 357: 462-469  

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