1 Department of Paediatrics, Paediatric Neurology, Beatrix Children's Hospital, University Medical Centre Groningen, University of Groningen, Groningen, The Netherlands. Electronic address: [email protected].
2 Department of Genetics, University Medical Centre Groningen, University of Groningen, Groningen, The Netherlands.
3 Department of Neurology, University Medical Centre Groningen, University of Groningen, Groningen, The Netherlands.
4 Department of Paediatrics, Department of Genetics, University Medical Centre Groningen, University of Groningen, Groningen, The Netherlands.