No abstract available
MeSH terms
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Asthma / epidemiology*
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Asthma / immunology
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Breast Feeding*
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Child
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Child, Preschool
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Female
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Humans
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Immunity, Maternally-Acquired
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Male
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Portugal
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Prevalence
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Risk Factors
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Sex Factors*
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Socioeconomic Factors
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Time Factors*
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Urban Population*