RT Journal Article SR Electronic T1 Incident opioid drug use and adverse respiratory outcomes among older adults with COPD JF European Respiratory Journal JO Eur Respir J FD European Respiratory Society SP 1602311 DO 10.1183/13993003.02311-2016 VO 49 IS 3 A1 Magnus Ekström A1 Sabrina Bajwah A1 Miriam J. Johnson YR 2017 UL http://erj.ersjournals.com/content/49/3/1602311.abstract AB