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, Damijan 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
Thorax Jan 2021, thoraxjnl-2020-214554; DOI: 10.1136/thoraxjnl-2020-214554