title: HEW asks full proof of efficacy, cost effectiveness of scanners.
mesh_terms: D003362:Cost-Benefit Analysis; D011787:Quality of Health Care; D014057:Tomography, X-Ray Computed / Q000191:economics / Q000706:statistics & numerical data*; D014481:United States; D014483:United States Dept. of Health and Human Services; D014600:Utilization Review