Acta Obstetricia Et Gynecologica Scandinavica · 1999 · 18 citations · 0 references
MedicineMaternal HealthObstetricsObstetric UltrasoundUltrasonographyUltrasoundEarly Pregnancy AssessmentFetal ImagingObstetric UltrasonographyPregnancy DiagnosisPregnancy ImagingSecond Trimester UltrasoundObstetric Ultrasound ScreeningSecond Trimester UltrasonographySecond-trimester Pregnancy Assessment