No abstract available
MeSH terms
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Analgesics, Opioid / administration & dosage
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Analgesics, Opioid / therapeutic use*
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Clinical Trials as Topic
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Headache / drug therapy*
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Humans
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Migraine Disorders / drug therapy*
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Pain / drug therapy*
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Receptors, Opioid / drug effects
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Treatment Outcome
Substances
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Analgesics, Opioid
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Receptors, Opioid