RT Journal Article SR Electronic T1 Defining the appropriate waiting time between multiple-breath nitrogen washout measurements JF European Respiratory Journal JO Eur Respir J FD European Respiratory Society SP 1489 OP 1491 DO 10.1183/09031936.00198414 VO 45 IS 5 A1 Elizabeth R. Salamon A1 Kevin R. Gain A1 Graham L. Hall YR 2015 UL http://erj.ersjournals.com/content/45/5/1489.abstract AB