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7-year-old FeNO levels and changes of FEV1 in bronchodilator reversibility tests at the asymptomatic early HDM-sensitized and non-sensitized group. (A) FeNO levels. (B) Changes of FEV1. Circles mark the mild outliers, and asterisks mark the extreme outliers. HDM: House dust mite; FeNO: Fractional exhaled nitric oxide; FEV1 Chg: Changes of forced expiratory volume in the first second
