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Until recently, no point-of-care tool was available for assessing the underlying airway inflammation associated with asthma. Fractional exhaled nitric oxide (FeNO) emerged in the last decade as an important biomarker for asthma assessment and management. Evidence also indicates that FeNO is most accurately classified as a marker of T-helper cell type 2 (Th2)-mediated airway inflammation with a high...
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