RT Journal Article SR Electronic T1 Mucolytics for COPD: negotiating a slippery slope towards proof of efficacy JF European Respiratory Journal JO Eur Respir J FD European Respiratory Society SP 1701465 DO 10.1183/13993003.01465-2017 VO 50 IS 4 A1 Shawn D. Aaron YR 2017 UL http://erj.ersjournals.com/content/50/4/1701465.abstract AB