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240 E.R. Guzman et al.<br />

Kofinas et al. [41] believed that they could define<br />

placental location by ultrasonography. They found<br />

that in both normal and hypertensive pregnancies<br />

with unilateral placentas the S/D ratio of the placental<br />

uterine artery was significantly lower than that of<br />

the contralateral artery (1.73 Ô 0.35 versus 2.46 Ô 0.73;<br />

p

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