No abstract available
MeSH terms
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Adolescent
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Age Distribution
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Analgesics / administration & dosage*
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Child
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Child, Preschool
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Chronic Disease
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Female
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Headache / diagnosis
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Headache / drug therapy*
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Headache / epidemiology
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Headache / etiology*
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Humans
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Incidence
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Male
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Prognosis
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Recurrence