Placenta PreviaPlacentaPlacenta AccretaUterine HemorrhageCardiotocographyVasa PreviaCesarean SectionPregnancyPregnancy Trimester, SecondUltrasonography, PrenatalCesarean Section, RepeatPlacenta DiseasesPostpartum HemorrhagePregnancy Trimester, ThirdAbruptio PlacentaeDilatation and CurettageAnemia, NeonatalPregnancy OutcomeEndotamponadeGestational AgePregnancy, High-RiskHysterectomyPremature BirthMaternal AgeParityPregnancy Trimester, FirstPregnancy ComplicationsPlacenta, Retained