RT Journal Article SR Electronic T1 Elucidating progression of early cystic fibrosis lung disease JF European Respiratory Journal JO Eur Respir J FD European Respiratory Society SP 1701916 DO 10.1183/13993003.01916-2017 VO 50 IS 5 A1 Kathryn Ramsey A1 Felix Ratjen A1 Philipp Latzin YR 2017 UL http://erj.ersjournals.com/content/50/5/1701916.abstract AB