No abstract available
MeSH terms
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Analgesics, Opioid* / administration & dosage
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Analgesics, Opioid* / history
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Chronic Pain / drug therapy
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Chronic Pain / etiology
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History, 20th Century
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History, 21st Century
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Humans
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Morphine* / administration & dosage
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Morphine* / history
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Neoplasms / complications
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Neoplasms / drug therapy
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World Health Organization
Substances
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Analgesics, Opioid
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Morphine