title: AAFP position on use of ultrasonography in obstetrics.
authors.forename: C B
authors.initials: CB
authors.lastname: Smith
mesh_terms: D005194:Family Practice; D005260:Female; D006801:Humans; D011247:Pregnancy; D012955:Societies, Medical; D016216:Ultrasonography, Prenatal / Q000592:standards / Q000706:statistics & numerical data*; D014481:United States