No abstract available
MeSH terms
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Analgesics, Opioid / adverse effects*
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Analgesics, Opioid / therapeutic use*
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Cohort Studies
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Drug Utilization
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Emergencies
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Emergency Service, Hospital / statistics & numerical data
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Headache / drug therapy*
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Headache Disorders / etiology*
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Headache Disorders / prevention & control
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Humans
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Migraine Disorders / drug therapy
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Opioid-Related Disorders / complications
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Salvage Therapy