title: Sensitivity of pocket Doppler fetal heart detectors in early pregnancy: a comparative study.
authors: Assisted Conception Unit, King's College Hospital, London, UK.
authors: J J
authors: JJ
authors: Waterstone
authors: S
authors: S
authors: Campbell
mesh_terms: D000553:Ambulatory Care; D005260:Female; D005307:Fertilization in Vitro; D005865:Gestational Age; D006340:Heart Rate, Fetal / Q000502:physiology*; D006801:Humans; D011247:Pregnancy; D011261:Pregnancy Trimester, First; D012680:Sensitivity and Specificity; D016216:Ultrasonography, Prenatal / Q000295:instrumentation*