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. 2015 May 19;5(5):e007502. doi: 10.1136/bmjopen-2014-007502

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Fraction of exhaled nitric oxide at 50 mL/s (FeNO₅₀) values in allergic and non-allergic participants by smoking habit. The broken line indicates our suggested cut-off value of 22.5 ppb. ns, not significant.