RT Journal Article SR Electronic T1 Relationship between depression and exacerbations in chronic obstructive pulmonary disease JF European Respiratory Journal JO Eur Respir J FD European Respiratory Society DO 10.1183/09031936.00120107 A1 J.K. Quint A1 R. Baghai-Ravary A1 G.C. Donaldson A1 J.A. Wedzicha YR 2008 UL http://erj.ersjournals.com/content/early/2008/03/05/09031936.00120107.abstract AB