1. Health Psychology, University of Leuven, Leuven, Belgium;
2. Institute for Psychotherapy and Medical Psychology, University of Würzburg, Würzburg, Germany;
3. Clinic Bad Reichenhall, Centre for Rehabilitation, Pneumology and Orthopedics, Bad Reichenhall, Germany;
4. Cardiovascular and Respiratory Rehabilitation, University of Leuven, Leuven, Belgium;
5. Pneumology, University of Leuven, Leuven, Belgium