Validity and responsiveness of the Daily- and Clinical visit-PROactive Physical Activity in COPD (D-PPAC and C-PPAC) instruments
Judith Garcia-Aymerich*, Milo A. Puhan, Solange Corriol-Rohou, Corina de Jong, Heleen Demeyer, Fabienne Dobbels, Damijen Erzen, Anja Frei, Elena Gimeno-Santos, Nicholas S. Hopkinson, Nathalie Ivanoff, Niklas Karlsson, Zafeiris Louvaris, Michael I. Polkey, Roberto A. Rabinovich, Mario Scuri, Maggie Tabberer, Ioannis Vogiatzis, Thierry Troosters
*Corresponding author for this work
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