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Watz , H , Pitta , F , Rochester , C L , Garcia-Aymerich , J , Zuwallack , R , Troosters , T , Vaes , A W , Puhan , M A , Jehn , M , Polkey , M I , Vogiatzis , I , Clini , E M , Toth , M , Gimeno-Santos , E , Waschki , B , Esteban , C , Hayot , M , Casaburi , R , Porszasz , J , McAuley , E , Singh , S J , Langer , D , Wouters , E F M , Magnussen , H & Spruit , M A 2014 , ' An official European Respiratory Society statement on physical activity in COPD ' , European Respiratory Journal , vol. 44 , no. 6 , pp. 1521-1537 . https://doi.org/10.1183/09031936.00046814.
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2014