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PurposeValidated measures of asthma and eczema at the population level remain a challenge. Our aim was to ascertain if register‐based information on asthma/eczema medication can function as a proxy for an asthma/eczema diagnosis and to validate register‐based asthma diagnoses.
MethodsInformation was requested on all 0–45‐year‐old individuals with reported asthma/eczema medication and/or diagnoses...
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