No abstract available
MeSH terms
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Anti-Asthmatic Agents / administration & dosage
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Asthma / diagnosis
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Asthma / drug therapy
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Asthma / epidemiology*
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Child, Preschool
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Cohort Studies
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Drug Utilization
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Female
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Humans
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Male
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Norway / epidemiology
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Prevalence
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Risk Factors
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Socioeconomic Factors
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Surveys and Questionnaires