1 Dept of Research and Education, CIRO, Horn, The Netherlands; Faculty of Medicine and Life Sciences, Rehabilitation Research Centre, Biomedical Research Institute, Hasselt University, Diepenbeek, Belgium.
2 Faculty of Medicine and Life Sciences, Rehabilitation Research Centre, Biomedical Research Institute, Hasselt University, Diepenbeek, Belgium.
3 KU Leuven-University of Leuven, Faculty of Kinesiology and Rehabilitation Sciences, Dept of Rehabilitation Sciences, Research Group for Cardiovascular and Respiratory Rehabilitation, Leuven, Belgium.
4 Longfunctie Afdeling, Meander Medisch Centrum, Amersfoort, The Netherlands.
5 National Heart and Lung Institute, Imperial College and Royal Bromton Hospital, London, UK.
6 Faculty of Biology, Medicine and Health, University of Manchester and The Christie NHS Foundation Trust, Manchester, UK.
7 Pulmonary Laboratory, Isala, Zwolle, The Netherlands.