RT Journal Article SR Electronic T1 What's the (end) point? JF European Respiratory Journal JO Eur Respir J FD European Respiratory Society SP 854 OP 855 DO 10.1183/09031936.00214214 VO 45 IS 3 A1 Mark-Jan Ploegstra A1 Rolf M.F. Berger YR 2015 UL http://erj.ersjournals.com/content/45/3/854.abstract AB