Poor agreement between chart-based and objectively identified comorbidities of COPD
Filip J.J. Triest, Frits M.E. Franssen, Martijn A. Spruit, Miriam T.J. Groenen, Emiel F.M. Wouters, Lowie E.G.W. Vanfleteren
European Respiratory Journal 2015; DOI: 10.1183/13993003.00667-2015