1. Rehabilitation Centre Beatrixoord, Haren and Department of Rehabilitation, Groningen University Hospital, Groningen, The Netherlands
2. Northern Centre for Health Care Research, University of Groningen, Groningen, The Netherlands
3. Rehabilitation Centre Beatrixoord, Haren, Groningen University Hospital, Groningen, The Netherlands
4. Department of Rehabilitation, Groningen University Hospital, Groningen, The Netherlands