1. Altrecht Psychosomatic Medicine, Zeist, The Netherlands,
2. Asthma Centre Heideheuvel, Hilversum, The Netherlands,
3. Department of Clinical and Health Psychology, Utrecht University, The Netherlands,
4. Revant, Pulmonary Rehabilitation Center ‘Schoondonck’, Breda, The Netherlands
5. Department of Medical Health Psychology, University of Tilburg, The Netherlands, and