To pay or not to pay: respondents' motivation for participating in research.
McKeganey
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D006801:Humans; D009042:Motivation; D010358:Patient Participation / Q000191:economics*; D012109:Research Support as Topic / Q000191:economics; D012201:Reward; D019966:Substance-Related Disorders / Q000191:economics*; D011795:Surveys and Questionnaires