RT Journal Article SR Electronic T1 Chronic obstructive pulmonary disease: inhale deeply and start to exercise JF European Respiratory Journal JO Eur Respir J FD European Respiratory Society SP 1700424 DO 10.1183/13993003.00424-2017 VO 49 IS 4 A1 Henrik Watz YR 2017 UL http://erj.ersjournals.com/content/49/4/1700424.abstract AB