Institute for Regional Health Services, University of Southern Denmark, Odense, Denmark. Department of Epilepsy Genetics and Personalized Medicine, Danish Epilepsy Center, Dianalund, Denmark. Institute for Genomic Statistics and Bioinformatics, University Hospital Bonn, Rheinische Friedrich-Wilhelms-University Bonn, Bonn, Germany. Department of Neuropediatrics, University Medical Center Schleswig-Holstein Christian Albrechts University, Kiel, Germany. CRMR Congenital Malformations and Diseases of the Cerebellum and Rare Causes of Intellectual Disabilities, Department of Genetics, Sorbonne University, AP-HP, Trousseau Hospital, Paris, France. Department of Clinical Genetics, Erasmus MC, University Medical Center, Rotterdam, the Netherlands. Children's Hospital, Fürth, Germany. Center for Medical Genetics, Ghent University Hospital, Ghent, Belgium. Department of Biomolecular Medicine, Ghent University, Ghent, Belgium. UMR1056 INSERM-Université de Toulouse, Department of Genetics, University Hospital of Toulouse, Toulouse, France. Department of Pediatric Neurology, University Hospital and University of Antwerp, Antwerp, Belgium. Institute of Human Genetics, University Hospital Essen, University of Duisburg-Essen, Essen, Germany. UMR S1127, Inserm U1127, CNRS UMR 7225, Institute of brain and spinal cord, Sorbonne University, Paris, France. Neurology Department, Medical Academy, Lithuanian University of Health Sciences, Kaunas, Lithuania. Medical Genomics and Metabolic Genetics Branch, National Human Genome Research Institute, National Institutes of Health, Bethesda, Maryland, USA. Medical Genetics Service, Hospital de Clinicas de Porto Alegre, Porto Alegre, Brazil. Department of Pediatric Neurology, AP-HP, GHUEP, Armand Trousseau University Hospital, Paris, France. GRC ConCer-LD, Sorbonne University, UPMC University of Paris 06, Paris, France. Division of Neurology, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA. Epilepsy NeuroGenetics Initiative, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA. Department of Biomedical and Health Informatics, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA. Sleep Disorders Center, AP-HP, Antoine-Béclère Hospital, Clamart, France. Department of Pediatrics and Neonatal Intensive Care, André Grégoire Hospital, Montreuil, France. Pediatric Neurology, Neurogenetics and Neurobiology Unit and Laboratories, Department of Neuroscience, A. Meyer Children's Hospital, University of Florence, Florence, Italy. Department of Genetics and Reference Center for Developmental Disorders, Normandy Center for Genomic and Personalized Medicine, Normandy University, UNIROUEN, Inserm U1245 and Rouen University Hospital, Rouen, France. Department of Cellular and Molecular Medicine, Faculty of Health Science, Copenhagen Center for Glycomics, Copenhagen, Denmark. Department of Genetics and Clinical Immunology, National Institute of Tuberculosis and Lung Diseases, Warsaw, Poland. Neuropediatrics Department, University Hospital of Toulouse, Toulouse, France. Department of Medical Genetics, University of Antwerp, Antwerp, Belgium. Pediatric Neurology Unit, Department of the Woman, Child, and Adolescent, University Hospitals Geneva, Geneva, Switzerland. Department of Clinical Genetics, Odense University Hospital, Odense, Denmark. Human Genetics, Department of Clinical Research, University of Southern Denmark, Odense, Denmark. Department of Genetics, Du Havre Hospital, Le Havre, France. Department of Medical Genetics, Lyon University Hospital, Lyon, France. Institut Neuromyogene, University Claude Bernard Lyon 1, Lyon University, Lyon, France. Division of Genetic and Genomic Medicine, Nationwide Children's Hospital, Columbus, Ohio, USA. Center for Cardiovascular Research, Nationwide Children's Hospital, Columbus, Ohio, USA. Department of Pediatrics, Ohio State University, Columbus, Ohio, USA. APHP, Department of Genetics, Pitié-Salpêtrière Hospital, Reference Center for Rare Causes of Intellectual Disabilities, Paris, France. Department of Genetics, Inserm U1127, CNRS UMR 7225, Institute for brain and spinal cord, ICM, AP-HP, De la Pitié Salpêtrière Hospital, Sorbonne University, Paris, France. Greenwood Genetic Center, Greenwood, South Carolina, USA. Department of Genetics, University of Bordeaux, Bordeaux, France. Department of Neuropaediatrics, Armand Trousseau Hospital, APHP, Paris, France. Department of Epilepsy, Zwolle, the Netherlands. Department of Medical Genetics, Warsaw Medical University, Warsaw, Poland. Department of Neurology, University of Alabama at Birmingham, Birmingham, Alabama, USA. Department of Clinical Genetics, Rigshospitalet/Kennedy Center, Glostrup, Denmark. Institute of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark. Undiagnosed Diseases Program, Common Fund, National Institutes of Health, Bethesda, Maryland, USA. Section of Human Biochemical Genetics, National Human Genome Research Institute, Bethesda, Maryland, USA. Cologne Center for Genomics, University Hospital Cologne, University of Cologne, Cologne, Germany. Stanley Center for Psychiatric Research, Broad Institute of Massachusetts Institute of Technology and Harvard, Cambridge, Massachusetts, USA. Analytic and Translational Genetics Unit, Massachusetts General Hospital, Boston, Massachusetts, USA. Epilepsy Center, Neurological Institute, Cleveland Clinic, Cleveland, Ohio, USA. Genomic Medicine Institute, Lerner Research Institute Cleveland Clinic, Cleveland, Ohio, USA. Department of Clinical Neurophysiology, Danish Epilepsy Center, Dianalund, Denmark. Department of Neurology, University of Pennsylvania, Perelman School of Medicine, Philadelphia, Pennsylvania, USA.