@article{Lopez2006,
author = {Lopez, A. and Shibuya, K. and Rao, C. and Mathers, C. and Hansell, A. and Held, L. and Schmid, V. and Buist, S.},
title= {Chronic obstructive pulmonary disease: Current burden and future projections},
year = {2006},
doi = {10.1183/09031936.06.00025805},
volume = {27},
pages = {397--412},
}