title: Controlled studies in measuring the efficacy of medical care: a historical perspective.
mesh_terms: D002986:Clinical Trials as Topic; D003362:Cost-Benefit Analysis; D049672:History, 19th Century; D049673:History, 20th Century; D010919:Placebos; D011446:Prospective Studies; D011897:Random Allocation; D012189:Retrospective Studies; D013673:Technology Assessment, Biomedical / Q000266:history*; D014481:United States