RT Journal Article SR Electronic T1 Nitrogen multiple breath washout test for infants with cystic fibrosis JF European Respiratory Journal JO Eur Respir J FD European Respiratory Society SP 1800015 DO 10.1183/13993003.00015-2018 VO 52 IS 2 A1 Václav Koucký A1 Veronika Skalická A1 Petr Pohunek YR 2018 UL http://erj.ersjournals.com/content/52/2/1800015.abstract AB