Physical Activity Characteristics across GOLD Quadrants Depend on the Questionnaire Used. von Heleen Demeyer, Elena Gimeno-Santos, Roberto A Rabinovich, Miek Hornikx, Zafeiris Louvaris, Willem I de Boer, Niklas Karlsson, Corina de Jong, Thys Van der Molen, Ioannis Vogiatzis, Wim Janssens, Judith Garcia-Aymerich, Thierry Troosters, Michael I Polkey, PROactive consortium

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