1. Sheffield Clinical Genetics ServiceSheffield Children's NHS Foundation Trust Sheffield UK
2. Clinical GeneticsBirmingham Women's and Children's NHS Foundation Trust Birmingham UK
3. South West Thames Regional Genetics ServiceSt George's, University of London UK
4. North East Regional Genetics ServiceGreat Ormond Street Hospital London UK
5. Clinical Genomics and Research Programs Gaithersburg Maryland
6. Human Genetics & Genomics, Northwell Health System New York USA
7. Assistance Publique–Hôpitaux de Paris, Département de Génétique and Centre de Référence Déficiences Intellectuelles de Causes RaresGroupe Hospitalier Pitié‐Salpêtrière France
8. Assistance Publique–Hôpitaux de Paris, Service de NeuropédiatrieHôpital Armand Trousseau
9. Département de génétique, hôpital Pitié‐SalpêtrièreAssistance publique‐Hôpitaux de Paris France
10. Wessex Clinical Genetics Service, Princess Anne Hospital Southampton UK
11. Academic Unit of Child HealthUniversity of Sheffield Sheffield UK