PlacentaPregnancyPregnancy ComplicationsPregnancy OutcomePregnancy, AnimalPlacenta DiseasesPregnancy, EctopicPregnancy Trimester, FirstPlacenta PreviaPregnancy Trimester, ThirdPlacenta AccretaPlacenta, RetainedPregnancy RatePregnancy TrimestersPregnancy ProteinsTrophoblastsPregnancy Complications, CardiovascularPregnancy Trimester, SecondPregnancy TestsPregnancy in DiabeticsPregnancy, MultipleMaternal-Fetal ExchangeGestational AgePregnancy, TubalPregnancy Complications, InfectiousPregnancy Complications, NeoplasticPre-EclampsiaPregnancy in AdolescenceChorionic VilliAbortion, SpontaneousPregnancy, High-RiskUterusPlacentationPregnancy, UnplannedFetusPregnancy, UnwantedInfant, NewbornFetal DeathPregnancy Complications, HematologicPregnancy Complications, ParasiticFetal Growth RetardationPregnancy, ProlongedPregnancy, TwinDeciduaUltrasonography, PrenatalPregnancy, AbdominalEmbryo ImplantationAbortion, InducedCesarean SectionFetal DevelopmentPregnancy MaintenanceLabor, ObstetricPlacental CirculationChorionEmbryo TransferBirth WeightFertilization in VitroParityPrenatal Exposure Delayed EffectsPrenatal CareExtraembryonic MembranesAmniotic FluidProgesteroneObstetric Labor, PrematurePremature BirthPlacental LactogenHypertension, Pregnancy-InducedMaternal AgeChorionic GonadotropinHydatidiform MoleMaternal ExposurePregnancy Reduction, MultifetalEndometriumDiabetes, GestationalFetal DiseasesDelivery, ObstetricPrenatal DiagnosisLactationAbnormalities, Drug-InducedTwinsCongenital AbnormalitiesInfertility, FemaleChoriocarcinomaAbortion, TherapeuticFetal BloodUterine HemorrhagePuerperal DisordersAbortion, HabitualParturitionMyometriumAbortion, VeterinaryAbortifacient Agents, NonsteroidalStillbirthPlacental HormonesGravidityInfant, Low Birth WeightInsemination, ArtificialAmnionRisk FactorsEmbryonic and Fetal Development