First trimester fetal heart rate measurements by transvaginal ultrasound combined with pulsed Doppler: an evaluation of 1331 cases

Author: Yapar E.G.   Ekici E.   Gokmen O.  

Publisher: Elsevier

ISSN: 0028-2243

Source: European Journal of Obstetrics & Gynecology and Reproductive Biology, Vol.60, Iss.2, 1995-06, pp. : 133-137

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