Radiologic riposte to Knowles.
D004469:Economics, Hospital; D005380:Financing, Government; D008007:Licensure, Medical; D008404:Massachusetts; D008511:Medicine; D011859:Radiography / Q000706:statistics & numerical data; D011871:Radiology; D012109:Research Support as Topic; D013038:Specialization; D014481:United States; D000078329:Workforce