BibTex format
@article{Garcia-Aymerich:2021:10.1136/thoraxjnl-2020-214554,
author = {Garcia-Aymerich, J and Puhan, MA and Corriol-Rohou, S and de, Jong C and Demeyer, H and Dobbels, F and Erzen, D and Frei, A and Gimeno-Santos, E and Hopkinson, NS and Ivanoff, N and Karlsson, N and Louvaris, Z and Polkey, MI and Rabinovich, RA and Scuri, M and Tabberer, M and Vogiatzis, I and Troosters, T and PROactive, consortium},
doi = {10.1136/thoraxjnl-2020-214554},
journal = {Thorax},
pages = {228--238},
title = {Validity and responsiveness of the Daily- and Clinical visit-PROactive Physical Activity in COPD (D-PPAC and C-PPAC) instruments},
url = {http://dx.doi.org/10.1136/thoraxjnl-2020-214554},
volume = {76},
year = {2021}
}