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wheezing preschool children that do not fulfill the criteria of "asthma" fully as asthma would require a person to demonstrate a history of at least three episodes of exacerbations (worsening of symptoms) or chronic cough or wheeze for the past six months. Besides, a number of wheezing preschool children would have their symptoms resolved after they had grown up, unlike asthma which persists into adulthood. Preschool wheezing can be divided into "viral-induced wheeze" and "multi-trigger

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