Center for Medical Genetics, UZ Brussel, Brussels, Belgium, Neurogenetics Research Group, Vrije Universiteit Brussel, Brussels, Belgium.|Center for Human Genetics, KU Leuven and University Hospitals Leuven, 3000 Leuven, Belgium.|Center for Medical Genetics, UZ Brussel, Brussels, Belgium.|Center for Medical Genetics, UZ Brussel, Brussels, Belgium, Reproduction, Genetics and Regenerative Medicine, Vrije Universiteit Brussel, Brussels, Belgium and.|Center for Medical Genetics, UZ Brussel, Brussels, Belgium, Reproduction, Genetics and Regenerative Medicine, Vrije Universiteit Brussel, Brussels, Belgium and.|Pediatric Neurology Unit, Department of Pediatrics, UZ Brussel, Brussels, Belgium Neurogenetics Research Group, Vrije Universiteit Brussel, Brussels, Belgium.