Original Research

Comparison of disease-severity measures within severe and very severe COPD patients: results from a nationally representative chart review and patient survey

Solem CT, Sun SX, Liu S, Macahilig C, Katyal M, Gao X, Shorr AF

International Journal of Chronic Obstructive Pulmonary Disease 2014, 9:991-998

Published Date: 23 September 2014