[1] Katholieke Univ Leuven, Univ Hosp, Resp Rehabil & Resp Div, Dept Pneumol, B-3000 Louvain, Belgium
[2] Univ Hosp, Dept Resp Rehabil, B-3000 Louvain, Belgium
[3] Katholieke Univ Leuven, Fac Kinesiol & Rehabil Sci, B-3000 Louvain, Belgium
[4] Maastricht Univ, Ctr Evidence Based Physiotherapy, Dept Epidemiol, Maastricht, Netherlands
[5] Maastricht Univ, Res Inst CAPHRI, Dept Gen Practice, Maastricht, Netherlands
[6] Univ Norte Parana, Dept Fisioterapia, Londrina, Brazil
[7] Hanze Univ, Res & Innovat Grp Hlth Care & Nursing, Groningen, Netherlands
[8] Erasmus MC, Dept Phys Therapy, Rotterdam, Netherlands
[9] Phys Therapy Practice Verhoef Utrecht, Utrecht, Netherlands
[10] Univ Appl Sci, Hogesch Leiden, Free Univ Med Ctr Amsterdam, Leiden, Netherlands
[11] Radboud Univ Nijmegen, Med Ctr, Univ Lung Ctr Dekkerswald, NL-6525 ED Nijmegen, Netherlands
[12] Univ Libre Bruxelles, CHU St Pierre, Dept Pneumol, Brussels, Belgium
[13] Catholic Univ Louvain, Clin Univ St Luc, Dept Pneumol, B-1200 Brussels, Belgium