Surveys identify barriers to participation in clinical trials.
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D002986:Clinical Trials as Topic / Q000191:economics / Q000706:statistics & numerical data*; D006801:Humans; D007348:Insurance, Health; D009369:Neoplasms / Q000188:drug therapy / Q000191:economics / Q000628:therapy*; D010344:Patient Advocacy; D018579:Patient Selection; D011795:Surveys and Questionnaires; D014481:United States