DOI:
10.1055/s-00000089
Ultraschall in der Medizin - European Journal of Ultrasound
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References
Owen J, Neely C, Northen A.
Transperineal versus endovaginal ultrasonographic examination of the cervix in the midtrimester: a blinded comparison.
Am J Obst Gynecol 1999;
181: 780-783
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