DOI:
10.1055/s-00000089
Ultraschall in der Medizin - European Journal of Ultrasound
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References
Kurtzman JT, Goldsmith LJ, Gall SA et al.
Transvaginal versus transperineal ultrasonography: a blinded comparison in the assessment of cervical length at midgestation.
Am J Obst Gynecol 1998;
179: 852-857
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