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Unteregger, B., Stolz, W. & Bastert, G. Endosonographische Messungen der Zervixlänge in der Schwangerschaft. Arch Gynecol Obstet 245, 108–109 (1989). https://doi.org/10.1007/BF02417196
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DOI: https://doi.org/10.1007/BF02417196