1. Department of Rehabilitation, Nijmegen Centre for Evidence Based Practice, Radboud University Nijmegen Medical Centre, P.O. Box 9101, 6500 HB Nijmegen, The Netherlands
2. Department of Rehabilitation, Sint Maartenskliniek, P.O. Box 9011, 6500 GM Nijmegen, The Netherlands
3. Research, Development & Education, Sint Maartenskliniek, P.O. Box 9011, 6500 GM Nijmegen, The Netherlands