Persutte, W H Advanced-practice sonography in obstetrics and gynecology: a pilot study investigating the efficacy of the ultrasound practitioner. [electronic resource] - Journal of allied health 1999 - 71-9 p. digital Publication Type: Comparative Study; Journal Article ISSN: 0090-7421 Subjects--Topical Terms: AdultAllied Health Personnel--educationColoradoCongenital Abnormalities--diagnostic imagingFemaleHumansJob DescriptionPilot ProjectsPregnancyPregnancy OutcomeProfessional AutonomyRadiology--educationReferral and ConsultationReproducibility of ResultsRetrospective StudiesSensitivity and SpecificityUltrasonography, Prenatal--methods