On trial: clinical research in the USA.
D035843:Biomedical Research / Q000191:economics / Q000458:organization & administration; D002318:Cardiovascular Diseases / Q000628:therapy; D002986:Clinical Trials as Topic / Q000191:economics / Q000706:statistics & numerical data*; D006801:Humans; D015279:Organizational Culture; D012109:Research Support as Topic; D014481:United States