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The minimal important difference of exercise tests in severe COPD.
Puhan MA, Chandra D, Mosenifar Z, Ries A, Make B, Hansel NN, Wise RA, Sciurba F; National Emphysema Treatment Trial (NETT) Research Group. Puhan MA, et al. Eur Respir J. 2011 Apr;37(4):784-90. doi: 10.1183/09031936.00063810. Epub 2010 Aug 6. Eur Respir J. 2011. PMID: 20693247 Free PMC article. Clinical Trial.