- Correspondence to: A Nieuwboer Department of Rehabilitation Sciences, Faculty of Kinesiology and Rehabilitation Sciences, Katholieke Universiteit Leuven, Tervuursevest 101, Heverlee 3001, Belgium;
- Received May 15, 2006
- Accepted August 17, 2006
- Revised August 2, 2006
- First published January 16, 2007.
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