RT Journal Article SR Electronic T1 Breath analysis for label-free characterisation of airways disease JF European Respiratory Journal JO Eur Respir J FD European Respiratory Society SP 1702586 DO 10.1183/13993003.02586-2017 VO 51 IS 1 A1 Stephen J. Fowler YR 2018 UL http://erj.ersjournals.com/content/51/1/1702586.abstract AB