1 Institute of Human Genetics, University of Leipzig Medical Center, Leipzig, Germany.
2 Institute of Biochemistry, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany.
3 The Saxon Epilepsy Center Kleinwachau, Radeberg, Germany.
4 Rare Disease Institute, Children's National Hospital, Washington, DC, USA.
5 Department of Child Neurology, Amsterdam University Medical Centers, Amsterdam, The Netherlands.
6 Institute of Child Health, University Collge London, London, UK.
7 Department of Pediatric Neurology and Developmental Medicine and LMU Center for Children with Medical Complexity, Dr. von Hauner Children's Hospital, LMU - University Hospital, LudwigMaximilians-Universität, Munich, Germany.
8 Neuromuscular and Neurogenetic Disorders of Childhood Section, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, MD, USA.
9 Department of Genetics, University Medical Center Utrecht, Utrecht, The Netherlands.
10 Departments of Pediatrics and Medicine, Columbia University Medical Center, New York, NY, USA.
11 Division of Cancer & Genetics, School of Medicine, Cardiff University, Wales, UK.
12 Department of Pathology, University of California San Francisco, San Francisco, CA, USA.
13 Rare Disease Institute, Division of Genetics and Metabolism, Children's National Hospital, Washington, DC, USA.
14 Departments of Neurosciences and Pediatrics, University of California San Diego and Division of Neurology, Rady Children's Hospital, San Diego, CA, USA.
15 Rady Children's Institute for Genomic Medicine, San Diego, CA, USA.
16 Department of Genetic Services, Kaiser Permanente Washington, Seattle, WA, USA.
17 Service de Génétique Clinique, Hôpital Jeanne de Flandre, CHU Lille, Lille, France.