No abstract available
MeSH terms
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Analgesics, Opioid / history
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Analgesics, Opioid / therapeutic use*
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Chronic Pain / drug therapy*
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Chronic Pain / epidemiology
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Chronic Pain / history
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Drug Prescriptions / statistics & numerical data*
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Drug Utilization / trends*
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History, 20th Century
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History, 21st Century
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Humans