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BackgroundPrevious cross‐sectional studies have suggested an association between asthma and attention‐deficit/hyperactivity disorder (ADHD), but the temporal relationship was not determined. Using a nationwide population‐based prospective case–control cohort study (1:4, age‐/gender‐matched), we hypothesized that asthma in infanthood or early childhood would increase the risk of ADHD in later life...
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