1. Department of Clinical Genetics; VU University Medical Center; Amsterdam The Netherlands
2. MRC Holland; Amsterdam The Netherlands
3. Department of Pediatrics; Mafraq Hospital; Abu Dhabi UAE
4. Department of Neurology, Boston Children's Hospital; Harvard Medical School; Boston MA USA
5. Children's Hospital Central California; Madera CA USA
6. Clinical Research Institute; Kanagawa Children's Medical Center; Yokohama Japan
7. Department of Clinical Chemistry, Metabolic Unit; VU University Medical Center; Amsterdam The Netherlands
8. Department of Clinical Genetics; Erasmus Medical Center; Rotterdam The Netherlands
9. Department of Neurogenetics, Kennedy Krieger Institute & Institute of Genetic Medicine; Johns Hopkins University School of Medicine; Baltimore MA USA