RT Journal Article SR Electronic T1 Hypoxaemia in COPD: looking beyond the lungs JF Breathe JO breathe FD European Respiratory Society SP 363 OP 370 DO 10.1183/18106838.0504.363 VO 5 IS 4 A1 Z. Shaikh A1 M.B. de Villa A1 N. Hopkinson YR 2009 UL http://breathe.ersjournals.com/content/5/4/363.abstract AB