DOI:
10.1055/s-00000089
Ultraschall in der Medizin - European Journal of Ultrasound
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References
Iams JD, Goldenberg RL, Meis PJ. et al.
The length of the cervix and the risk of spontaneous premature delivery. National Institute of Child Health and Human Development Maternal Fetal Medicine Unit Network.
N Engl J Med 1996;
334: 567-572
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