RT Journal Article SR Electronic T1 Oxygen JF Breathe JO Breathe FD European Respiratory Society SP 161 OP 162 DO 10.1183/20734735.0264-2019 VO 15 IS 3 A1 Claudia C. Dobler YR 2019 UL http://breathe.ersjournals.com/content/15/3/161.abstract AB