What is the impact of free drug samples on patients?
Downey
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D016527:Drug Costs; D004345:Drug Industry / Q000191:economics*; D011307:Drug Prescriptions / Q000191:economics*; D006801:Humans; D008389:Marketing of Health Services; D017057:Medically Uninsured; D010818:Practice Patterns, Physicians' / Q000191:economics*; D014481:United States