1. Sheffield Clinical Genetics Service, Sheffield Children's NHS Foundation Trust Sheffield UK
2. Academic Unit of Child Health, Department of Oncology & Metabolism University of Sheffield Sheffield UK
3. Sheffield Diagnostic Genetics Service, Sheffield Children's NHS Foundation Trust Sheffield UK
4. GeneDx, Inc Gaithersburg Maryland USA
5. Department of Pediatrics New York University School of Medicine New York New York USA
6. Division of Child and Adolescent Neurology, Departments of Neurology and Pediatrics Mayo Clinic Rochester Minnesota USA
7. Department of Pediatrics, Division of Medical Genomics Inova Health System Falls Church Virginia USA
8. Department of Medical Genetics Cambridge Institute for Medical Research, University of Cambridge Cambridge UK
9. Département de Génétique Médicale CHU de Montpellier Montpellier France
10. Wessex Clinical Genetics Services University Hospital Southampton NHS Foundation Trust Southampton UK
11. Faculty of Medicine University of Southampton Southampton UK
12. Clinical Genetics Service, Nottingham University Hospitals NHS Trust Nottingham UK
13. Teesside Genetics Unit, The James Cook University Hospital Middlesbrough UK
14. Departments of Medical Genetics and Paediatric Neurology Cambridge University Hospitals NHS Foundation Trust Cambridge UK
15. Service de génétique médicale, CHU Nantes Nantes France
16. Medical Genetics and Metabolism, Children's Hospital of The King's Daughters Eastern Virginia Medical School Norfolk Virginia USA
17. Department of Clinical Genetics Erasmus MC University Medical Center Rotterdam The Netherlands
18. Lucile Packard Children's Hospital, Stanford Children's Health Palo Alto California USA
19. Division of Neurogenetics Kennedy Krieger Institute Baltimore Maryland USA
20. Department of Neurology Johns Hopkins University School of Medicine Baltimore Maryland USA
21. Department of Pediatrics, Medical Genetics Cedars‐Sinai Medical Center Los Angeles California USA
22. University of Miami, Miller School of Medicine Miami Florida USA
23. Department of Pediatrics, Division of Genetics University of California, San Francisco San Francisco California USA
24. Department of Pediatrics Care National Hospital Riyadh Saudi Arabia
25. West Midlands Regional Genetics Service, Birmingham Women's and Children's Hospital Birmingham UK
26. Clinical Genetics Service, NHS Grampian, Aberdeen Royal Infirmary Aberdeen UK
27. Neurology Clinic, Department of Medicine, Santa Maria della Misericordia Hospital University of Perugia Perugia Italy
28. Medical Genetics Unit, Santa Maria della Misericordia Hospital University of Perugia Perugia Italy
29. Genetics Unit, "Mauro Baschirotto" Institute for Rare Diseases (B.I.R.D.), Costozza di Longare Vicenza Italy
30. Autism & Developmental Medicine Institute, Geisinger Danville Pennsylvania USA
31. Department of Human Genetics Radboud University Medical Center Nijmegen The Netherlands
32. Division of Medical Genetics, Department of Pediatrics Weill Cornell Medical College New York New York USA
33. Divsion of Medical Genetics, Departments of Pediatrics Queen's University Kingston Ontario Canada
34. UFR Des Sciences de Santé, INSERM‐Université de Bourgogne UMR1231 GAD Génétique des Anomalies du Développement, FHU‐TRANSLAD Dijon France
35. Department of Clinical Genetics Oxford University Hospitals NHS Trust Oxford UK
36. Department of Translational Genomics Center for Genomic Medicine, King Faisal Specialist Hospital and Research Center Riyadh Saudi Arabia
37. University of Colorado & Children's Hospital Colorado Denver Colorado USA
38. Division of Child Neurology, Department of Pediatrics Santa Casa de São Paulo School of Medical Sciences São Paulo Brazil
39. EDS National Diagnostic Service, Sheffield Children's NHS Foundation Trust Sheffield UK
40. Bristol Regional Genetics Service, St Michael's Hospital Bristol UK
41. Department of Clinical Genetics Temple Street Children's Hospital Dublin Ireland
42. Center for Applied Genomics, The Children's Hospital of Philadelphia Philadelphia Pennsylvania USA
43. Cedars‐Sinai Medical Center, Harbor‐UCLA Medical Center, David Geffen School of Medicine at UCLA Los Angeles California USA