Comments from the editor.
Philip W
PW
Ralls
D006801:Humans; D011832:Radiation Injuries / Q000191:economics / Q000209:etiology* / Q000517:prevention & control*; D011835:Radiation Protection / Q000191:economics / Q000379:methods*; D014057:Tomography, X-Ray Computed / Q000009:adverse effects* / Q000191:economics; D014463:Ultrasonography / Q000191:economics / Q000639:trends*; D014481:United States