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APA Citation
Garcia-Aymerich, J., Puhan, M. A., Corriol-Rohou, S., de Jong, C., Demeyer, H., Dobbels, F., Erzen, D., Frei, A., Gimeno-Santos, E., Hopkinson, N. S., Ivanoff, N., Karlsson, N., Louvaris, Z., Polkey, M. I., Rabinovich, R. A., Scuri, M., Tabberer, M., Vogiatzis, I., & Troosters, T. (2021). validity and responsiveness of the Daily- and Clinical visit-PROactive Physical Activity in COPD (D-PPAC and C-PPAC) instruments. Thorax, 76(3), 228–238. http://access.bl.uk/ark:/81055/vdc_100127563859.0x000061