Association between patient-reported outcomes and exercise test outcomes in patients with COPD before and after pulmonary rehabilitation oleh Roy Meys, Anouk A. F. Stoffels, Sarah Houben-Wilke, Daisy J. A. Janssen, Chris Burtin, Hieronymus W. H. van Hees, Frits M. E. Franssen, Bram van den Borst, Emiel F. M. Wouters, Martijn A. Spruit, on behalf of the BASES-consortium