1. Department of Rehabilitation Medicine, Center for Rehabilitation, University Medical Center Groningen, University of Groningen The Netherlands
2. Revalidatie Friesland Center for Rehabilitation, Beetsterzwaag, The Netherlands
3. Department of Oral and Maxillofacial Surgery, University Medical Center Groningen, University of Groningen, The Netherlands
4. Department of Paediatrics, University Medical Center Groningen, University of Groningen, The Netherlands
5. Adelante Zorggroep Center for Rehabilitation, Valkenburg, The Netherlands