Recently, a cross-talk error with commercial multiple breath nitrogen washout (MBWN 2 ) software was discovered, which produced an absolute over-reading of N 2 of approximately 1%, i.e., 2% N 2 read as 3%. This caused an extended tail to the washout, and over-estimated lung clearance index (LCI 2.5 ) values. Subsequently an updated and corrected software version has been released. Within the field there have been
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