title: North America.
authors.affiliation: Department of Radiology, University of Missouri-Columbia, Health Sciences Center, Columbia, Missouri 65212, USA.
authors.forename: R L
authors.initials: RL
authors.lastname: Bree
mesh_terms: D005544:Forecasting; D006801:Humans; D011320:Primary Health Care / Q000458:organization & administration*; D011786:Quality Control; D012106:Research; D014463:Ultrasonography / Q000706:statistics & numerical data*; D014481:United States