BODE index versus GOLD classification for explaining anxious and depressive symptoms in patients with COPD – a cross-sectional study
Georg-Christian Funk, Kathrin Kirchheiner, Otto Chris Burghuber, and Sylvia Hartl
Respir Res. 2009; 10(1): 1. Published online 2009 January 9. doi: 10.1186/1465-9921-10-1.PMCID: PMC2626579