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Ultrasound parameters prior to treatment at E15.5 and E17.5. (A) UA diameter, (B) UA blood flow, (C) reflection coefficient, and (D) UA pulsatility index at gestational age E15.5 and E17.5. Main effect of gestational age as determined by a two-way ANOVA is noted as Page. Data shown as means ±95% confidence intervals and n refers to the number of fetuses.
