RT Journal Article SR Electronic T1 Attitudes of patients with chronic breathlessness towards treatment with opioids JF European Respiratory Journal JO Eur Respir J FD European Respiratory Society SP 1901752 DO 10.1183/13993003.01752-2019 A1 Verberkt, Cornelia Antonia A1 van den Beuken-van Everdingen, Marieke H. J. A1 Wouters, Emiel F. M. A1 Janssen, Daisy J. A. YR 2019 UL http://erj.ersjournals.com/content/early/2019/10/31/13993003.01752-2019.abstract AB