European Respiratory Journal, 46(4), 988-1000. EUROPEAN RESPIRATORY SOC JOURNALS LTD EUROPEAN RESPIRATORY JOURNAL Recercat. Dipósit de la Recerca de Catalunya instname Gimeno-Santos, E, Raste, Y, Demeyer, H, Louvaris, Z, de Jong, C, Rabinovich, R A, Hopkinson, N S, Polkey, M I, Vogiatzis, I, Tabberer, M, Dobbels, F, Ivanoff, N, de Boer, W I, van der Molen, T, Kulich, K, Serra, I, Basagaña, X, Troosters, T, Puhan, M A & Karlsson, N & Garcia-Aymerich, J 2015, ' The PROactive instruments to measure physical activity in patients with chronic obstructive pulmonary disease ', European Respiratory Journal, vol. 46, no. 4, pp. 988-1000 . https://doi.org/10.1183/09031936.00183014 The European Respiratory Journal