1. Department of Physical Medicine and Rehabilitation, University of Alabama at Birmingham, Birmingham, AL 35294, USA
2. Department of Human Movement Sciences, Faculty of Behavioural and Movement Sciences, Amsterdam Movement Sciences, Vrije Universiteit Amsterdam, 1081 BT Amsterdam, The Netherlands
3. Amsterdam Rehabilitation Research Center|Reade, 1054 HW Amsterdam, The Netherlands
4. Center of Excellence for Rehabilitation Medicine, UMCU Brain Center, University Medical Center Utrecht and De Hoogstraat Rehabilitation, 3583 TM Utrecht, The Netherlands
5. Center for Rehabilitation, University Medical Center Groningen, University of Groningen, 9713 GZ Groningen, The Netherlands
6. Research and Development, Heliomare Rehabilitation Center, 1949 EC Wijk aan Zee, The Netherlands