Department of Epilepsy Genetics and Personalized Treatment (K.M.J., E.G., C.E.G., A.B., R.S.M., G.R.), The Danish Epilepsy Centre Filadelfia, member of ERN EpiCARE, Dianalund; Institute for Regional Health Research (K.M.J., E.G., A.B., R.S.M), University of Southern Denmark, Odense; Department of Neurology (R.P.W.R.), Maastricht University Medical Centre (MUMC+); Academic Centre for Epileptology Kempenhaeghe/MUMC+ (R.P.W.R.), Maastricht; School for Mental Health and Neuroscience (R.P.W.R.), Maastricht University; Department of Clinical Genetics (M.R.), Maastricht University Medical Center, the Netherlands; APHP, Sorbonne Université (S.W.), Hôpital Armand Trousseau, UF de Génétique Clinique, Centre de Référence Anomalies du Développement et Syndromes Malformatifs, Paris, France; Department of Genetics (B.K., J.B., T.C., C.N.), Pitié-Salpêtrière hospital, APHP, Sorbonne Université, Paris, France; Department of Clinical Genomics (K.J.W.), Mayo Clinic Florida, Jacksonville; Service de Génétique Médicale (B.I., A.P., A.-S.D.-P.), CHU de Nantes; Centre de Référence Anomalies du Développement et Syndromes Malformatifs (L.F., A.G., S.M.), FHU TRANSLAD, CHU Dijon; INSERM UMR1231 (L.F., A.G., S.M., F.T.M.-T., A.V.), GAD team, Université de Bourgogne-Franche Comté, Dijon; Unité Fonctionnelle dInnovation diagnostique des maladies rares (F.T.-M.-T., A.V.), Pôle de Biologie, FHU-TRANSLAD, CHU Dijon Bourgogne; Department of Medical Genetics (C.C., M.W.), Rare Diseases and Personalized Medicine, CHU Montpellier, France; Childrens Hospital Colorado (A.L.), Anschutz Medical Campus, Aurora, CO; Division of Clinical Neuroscience (M.J.E., J.P.A.), Department of Pediatrics, Alberta, Canada; Alberta Childrens Hospital (J.P.A., F.B.), Cumming School of Medicine, University of Calgary, Alberta, Canada; Department of Pediatrics (W.A.-H.), Division of Genetics and Genomics, Boston Childrens Hospital and Harvard Medical School, MA; Instituto de Neurología Infanto Juvenil (B.G.), Neuroinfan; Instituto de Genetica-Hospital Universitario (A.M.), Universidad Nacional de Cuyo; Instituto de Histología y Embriología de Mendoza (IHEM) (L.M.), Universidad Nacional de Cuyo, Mendoza, Argentina; Azienda Ospedaliera Universitaria Pisana (A.O.); Neuropaediatric Section (A.B.), Pediatric Department, Santa Chiara University Hospital, Pisa; Department of Medical Sciences- Pediatric Section (A.S.), University of Ferrara, Italy; CHU Bordeaux (J.V.-G.), Bordeaux, France; West Midlands Regional Genetics Service (J.V.), Birmingham Women's and Children's Hospital, Birmingham, UK; Child Neuropsychiatric Division (S.D., L.G.), Spedali Civili, Brescia, Italy; Institut de Pathologie et de Génétique (IPG) (S.M.), Gosselies, Belgium; Divisions of Child and Adolescent Neurology and Epilepsy (E.W.), Department of Neurology, Mayo Clinic, Rochester, MN; Oxford Centre for Genomic Medicine (S.H., H.S.); Oxford University Hospitals NHS Trust (U.K.), United Kingdom; Blank Children's Developmental Center (N.N.), Unity Point Health, West Des Moines, IA; Sutter Medical Centre (S.A.), Sacramento, CA; Kennedy Krieger Institute (J.S.C.); Johns Hopkins University (S.R.N.), Baltimore, MD; Provincial Medical Genetics Program (A.C.), St. Johns Medical Center, NL, Canada; University Medical Center Utrecht (E.H.B.), Utrecht, the Netherlands; Rush University Medical Center (M.H.L., C.B.), Chicago, IL; Medical Genetic Unit (S.B., D.O.), Maternal and Child Department, Ferrara University Hospital; Medical Science Department (D.O.), Ferrara University; Neonatal Intensive Care Unit (E.B.), Pediatric Section, Department of Medical Sciences, Ferrara University, Italy; Department of Clinical Genetics (C.R.), LUMC, Leiden, the Netherlands; Pediatric Unit, Maternal and Child Department (R.F.), Ferrara University Hospital, Italy; APHP Trousseau (A.A., C.M., D.H.); Service de Neuropédiatrie (D.R., A.I.), Hopital Trousseau, Sorbonne Université, APHP.SU, Paris, France; HudsonAlpha Institute for Biotechnology (D.B.), Huntsville, AL; Department of Pediatrics (D.S., S.K.), Weill Cornell Medicine, New York; Queensland Children's Hospital (D.C.), Brisbane, QL, Australia; Department of Neurology (B.G.), Stichting Epilepsie Instellingen Nederland, Zwolle, the Netherlands; Department of Neurology (O.D.), NYU School of Medicine; Atrium Healths Levine Childrens Hospital (L.A.D.), Charlotte, NC; Phoenix Childrens Hospital (T.G.), the University of Arizona College of Medicine; Division of Child Neurology and Psychiatry (D.P.), Azienda Ospedaliero Universitaria; Neurology and Epileptology Unit (I.C.), Pediatric Department, Brotzu Hospital Trust, Cagliari, Italy; Liverpool Centre for Genomic Medicine (L.G., G.R.), Liverpool Womens NHS Foundation Trust, Liverpool, United Kingdom; U.O. Genetica Medica (C.G.), Policlinico S. Orsola-Malpighi, Bologna, Italy; Department of Children's neurosciences (R.R.S.), Guys and ST. Thomas' NHS foundation trust, London United Kingdom; Department of Child Neuropsychiatry (G.C.), University of Verona, Italy; Christian Medical College (S.Y.), Vellore, India; Neurology Pediatric Unit (F.G.), Pediatric Department, Fernandes Figueira Institute, Fiocruz, Brazil; Royal Childrens Hospital (F.J.L.), Melbourne, Australia; Research & Innovation S.r.l. (D.C.), Padova; Pediatric Neurology Unit (S.O., B.S., F.V.), V. Buzzi Childrens Hospital, Milan, Italy; Department of Paediatrics (A.V.A.), London Health Science Centre/Schulich School of Medicine and Dentisty, University of Western Ontario, London, ON, Canada; Ambry Genetics (K.R.), Aliso Viejo, CA; Advocate Lutheran General Hospital (F.T.), Park Ridge, IL; PPG Pediatric Neurology (A.S.K.), Parkview Health, Fort Wayne, IN; Department of Medical Genetics (C.O.), AP-HP, Necker-Enfants Malades Hospital, Paris, France; Department of Neurology (W.B.), UC Davis, Sacramento, CA; Department of Pediatrics (K.K.), Texas A&M University Medical School, Austin; Leeds General Infirmary (S.H,), United Kingdom; Thompson River Pediatrics (A.F.), Johnstown, CO; Department of Neuropediatrics (S.G.), University Hospital Copenhagen, Denmark; Division of Neurology (F.B., R.W.), Department of Paediatrics, The Hospital for Sick Children, Toronto, Ontario, Canada; Hunter Genetics Unit, Waratah, Australia (A.R.); Wessex Clinical Genetics Service, Princess Anne Hospital, Southampton, United Kingdom (N.F., D.H.); KBO-Kinderzentrum München, Munich, Germany (M.S.); Division of Neurology, Epilepsy Neurogenetics Initiative, Childrens Hospital of Philadelphia (J.B., K.L.H., I.H., X.R.O-G, H.D.); Perelman School of Medicine, Philadelphia, PA (J.B.); PURA Syndrome Foundation, Greensborough, Australia (I.H., M.A., D.S.); PURA Syndrome Foundation, Kansas City, MO (I.H., D.S.).