RT Journal Article SR Electronic T1 Poor agreement between chart-based and objectively identified comorbidities of COPD JF European Respiratory Journal JO Eur Respir J FD European Respiratory Society SP ERJ-00667-2015 DO 10.1183/13993003.00667-2015 A1 Filip J.J. Triest A1 Frits M.E. Franssen A1 Martijn A. Spruit A1 Miriam T.J. Groenen A1 Emiel F.M. Wouters A1 Lowie E.G.W. Vanfleteren YR 2015 UL http://erj.ersjournals.com/content/early/2015/09/04/13993003.00667-2015.abstract AB