DOI:
10.1055/s-00000089
Ultraschall in der Medizin - European Journal of Ultrasound
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References
Badir S, Mazza E, Zimmermann R. et al.
Cervical softening occurs early in pregnancy: characterization of cervical stiffness in 100 healthy women using the aspiration technique.
Prenatal diagnosis 2013;
33: 737-741
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