No abstract available
MeSH terms
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Analgesics / adverse effects*
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Analgesics / therapeutic use*
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Barbiturates / adverse effects*
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Barbiturates / therapeutic use*
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Chronic Disease
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Headache Disorders, Secondary / chemically induced*
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Headache Disorders, Secondary / prevention & control
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Humans
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Migraine Disorders / chemically induced*
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Migraine Disorders / drug therapy*