title: Research strategies for the use of imaging ultrasound as an obstetric screening tool.
mesh_terms: D003955:Diagnostic Tests, Routine / Q000191:economics; D004995:Ethics, Professional; D005260:Female; D006801:Humans; D011247:Pregnancy; D011296:Prenatal Diagnosis; D012449:Safety; D014463:Ultrasonography / Q000191:economics