The influence of COPD on health-related quality of life independent of the influence of comorbidity.

Manen, J.G. van, Bindels, P.J.E., Dekker, F.W., Bottema, B.J.A.M., Zee, J.S. van der, IJzermans, C.J., Schadé, E. The influence of COPD on health-related quality of life independent of the influence of comorbidity. Journal of Clinical Epidemiology: 2003, 56(12), 1177-1184