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@article{Calverley_2003, title={Chronic obstructive pulmonary disease}, volume={362}, ISSN={0140-6736}, url={http://dx.doi.org/10.1016/s0140-6736(03)14416-9}, DOI={10.1016/s0140-6736(03)14416-9}, number={9389}, journal={The Lancet}, publisher={Elsevier BV}, author={Calverley, PMA and Walker, Paul}, year={2003}, month=sep, pages={1053–1061} }