RT Journal Article SR Electronic T1 Nitrogen offset in N2 multiple washout method JF ERJ Open Research JO erjor FD European Respiratory Society SP 00043-2020 DO 10.1183/23120541.00043-2020 VO 6 IS 1 A1 Katie J. Bayfield A1 Eric Alton A1 Samantha Irving A1 Andrew Bush A1 Jane C. Davies YR 2020 UL http://openres.ersjournals.com/content/6/1/00043-2020.abstract AB