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To the Editor:Khan et al1 screened women for increased risk of preeclampsia using uterine artery Doppler waveforms at 18 to 20 weeks gestation. However, at this gestational age a high proportion of the abnormal waveforms may still normalize. Bower et al showed that 16% of 2058 unselected women …

Uterine Artery Doppler and Changes in Endothelial Function Before Clinical Disease in Preeclamptic Women