Changes in forced expiratory volume in 1 second over time in COPD.

By Jorgen Vestbo, L. Edwards, P. Scanlon, J. Yates, Alvar Agusti, P. Bakke, P. Calverley, Bartolome Celli, H. Coxson, C. Crim and 7 more. New England Journal of Medicine, 2011

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