RT Journal Article SR Electronic T1 Fade to black! JF Breathe JO Breathe FD European Respiratory Society SP 200221 DO 10.1183/20734735.0221-2020 VO 16 IS 4 A1 Zohaib Yousaf A1 Muhammad Bilal Jamshaid A1 Dawlat Khan A1 Khaled A. Murshed A1 Huma Munir YR 2020 UL http://breathe.ersjournals.com/content/16/4/200221.abstract AB