1. B.W. Van der Linde, PhD, University of Groningen, University Medical Center Groningen, Center for Human Movement Sciences, PO Box 196, 9700 AD Groningen, the Netherlands, and Hanze University of Applied Sciences, Institute for Sports Studies, Zernikeplein 17, 9747 AS, Groningen, the Netherlands.
2. J.J. van Netten, PhD, Department of Surgery, Hospital Group Twente, Almelo, the Netherlands.
3. B. Otten, PhD, University of Groningen, University Medical Center Groningen, Center for Human Movement Sciences.
4. K. Postema, PhD, Department for Rehabilitation Medicine, University of Groningen, University Medical Center Groningen, Center for Rehabilitation.
5. R.H. Geuze, PhD, Department of Clinical and Developmental Neuropsychology, University of Groningen.
6. M.M. Schoemaker, PhD, University of Groningen, University Medical Center Groningen, Center for Human Movement Sciences.