title: Report of the subgroup for the rational use of ultrasound.
mesh_terms: D001783:Blood Flow Velocity; D003362:Cost-Benefit Analysis; D005260:Female; D005333:Fetus / Q000098:blood supply; D006801:Humans; D010500:Perinatology; D010920:Placenta / Q000098:blood supply; D011247:Pregnancy; D012680:Sensitivity and Specificity; D018608:Ultrasonography, Doppler / Q000295:instrumentation / Q000379:methods / Q000706:statistics & numerical data; D016216:Ultrasonography, Prenatal / Q000009:adverse effects / Q000295:instrumentation / Q000706:statistics & numerical data; D014599:Uterus / Q000098:blood supply