RT Journal Article SR Electronic T1 Breathlessness despite optimal pathophysiological treatment: on the relevance of being chronic JF European Respiratory Journal JO Eur Respir J FD European Respiratory Society SP 1701376 DO 10.1183/13993003.01376-2017 VO 50 IS 3 A1 Peter M.A. Calverley YR 2017 UL http://erj.ersjournals.com/content/50/3/1701376.abstract AB