1. University of Groningen, University Medical Center Groningen, Department of Paediatrics, Division of Developmental Neurology, Hanzeplein 1, Groningen, the Netherlands
2. University of Groningen, University Medical Center Groningen, Center for Rehabilitation, Department of Rehabilitation Medicine Hanzeplein 1, Groningen, the Netherlands
3. Rehabilitation Center “Revalidatie Friesland,” Hoofdstraat 3, Beetsterzwaag, The Netherlands