1. Brain Center Rudolf Magnus and Center of Excellence in Rehabilitation Medicine, De Hoogstraat Rehabilitation and University Medical Center Utrecht, Utrecht, The Netherlands;
2. Spinal Cord Injury Department, De Hoogstraat Rehabilitation, Utrecht, The Netherlands;
3. Amsterdam Rehabilitation Research Center| Reade, Amsterdam, The Netherlands;
4. University of Groningen, University Medical Center Groningen, Center for Human Movement Sciences, Groningen, The Netherlands;
5. University of Groningen, University Medical Center Groningen, Center for Rehabilitation, Department of Rehabilitation Medicine, Groningen, The Netherlands