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Bed RestHead-Down TiltWeightlessness SimulationPrenatal Exposure Delayed EffectsPrenatal DiagnosisPrenatal CareWeightlessness CountermeasuresRestCardiovascular DeconditioningSpace FlightBedsPregnancyWeightlessnessUltrasonography, PrenatalOrthostatic IntoleranceLower Body Negative PressureFetal DiseasesPhysiciansMedical Staff, HospitalBed OccupancyInfant, NewbornTime FactorsPhysician-Patient RelationsSupine PositionMuscular AtrophyMuscle, SkeletalExercisePlasma VolumeEarly AmbulationHypotension, OrthostaticAttitude of Health PersonnelMaternal ExposureGestational AgeFamily PracticeQuestionnairesHypovolemiaAmniocentesisChorionic Villi SamplingVascular CapacitanceAmino Acids, EssentialImmobilizationGreat Britain