1. Rehabilitation Center Vogellanden, Zwolle, The Netherlands;
2. Department of Rehabilitation Medicine, Rehabilitation Center De Hoogstraat, Utrecht, The Netherlands;
3. Department of Rehabilitation Medicine, Rehabilitation Center Rijndam, Rotterdam, The Netherlands;
4. Rehabilitation Center De Sint Maartenskliniek, Nijmegen, The Netherlands;
5. Department of Rehabilitation Medicine, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands