Napolitano, Raffaele Mean, lowest, and highest pulsatility index of the uterine artery and adverse pregnancy outcome in twin pregnancies. [electronic resource] - American journal of obstetrics and gynecology Jun 2012 - e8-9; author reply e9 p. digital Publication Type: Letter; Comment ISSN: 1097-6868 Standard No.: 10.1016/j.ajog.2012.02.030 doi Subjects--Topical Terms: FemaleHumansPre-Eclampsia--diagnostic imagingPregnancyPregnancy Outcome--epidemiologyPregnancy, Twin--physiologyPulsatile Flow--physiologyUltrasonographyUterine Artery--diagnostic imaging