North America.
Bree
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Department of Radiology, University of Missouri-Columbia, Health Sciences Center, Columbia, Missouri 65212, USA.
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