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Objective
Sufficient vitamin D (25‐hydroxyvitamin D [25(OH)D]) serum levels are associated with decreased asthma symptoms. Our aim was to investigate associations between vitamin D and atopy, asthma, asthma severity, and asthma phenotypes in Brazilian teenagers.
Methods
This cross‐sectional study involved 942 individuals (11–19 years old) engaged in an asthma cohort. The ISAAC questionnaire was...
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