Lucelle van de Ven-Stevens (During project: Radboud University Medical Centre, Department of Rehabilitation, Nijmegen, The Netherlands), Maud Graff (Radboud University Medical Centre, Donders Centre for Neuroscience, Department of Rehabilitation, Nijmegen, The Netherlands), Ruud Selles (Erasmus University Medical Center - Department of Rehabilitation and Department of Plastic and Reconstructive Surgery, Rotterdam, The Netherlands), Ton Schreuders (Erasmus University Medical Center - Department of Rehabilitation and Department of Plastic and Reconstructive Surgery, Rotterdam, The Netherlands), Harmen van der Linde (Radboud University Medical Centre, Department of Rehabilitation, Nijmegen, The Netherlands), Paul Spauwen (Radboud University Medical Centre - Department of Plastic and Reconstructive Surgery, Nijmegen, The Netherlands, and Wilhelminenspital, Vienna, Austria.), Sander Geurts (Radboud University Medical Centre, Donders Centre for Neuroscience, Department of Rehabilitation, Nijmegen, The Netherlands)