1. Radboud University Medical Centre; Department of Rehabilitation, Donders Institute for Brain, Cognition and Behaviour; PO Box 9101 Nijmegen Netherlands 6500 HB
2. Rehabilitation Centre Klimmendaal; Arnhem Netherlands
3. Medical Centre Leeuwarden; Department of Neurology; Leeuwarden Netherlands
4. Radboud University Medical Centre; Department of Neurology, Donders Institute for Brain, Behaviour and Cognition; Nijmegen Netherlands