1. Sheffield Children's Hospital NHS Foundation Trust; Western Bank; Sheffield UK
2. Clinical Genetics Department; Alder Hey Children's NHS Foundation Trust; Liverpool UK
3. Department of Clinical Genetics, Churchill Hospital; Oxford University Hospitals NHS Trust; Oxford UK
4. Wessex Clinical Genetics Service; University Hospitals Southampton; Southampton UK
5. Human Genetics and Genomic Medicine; Faculty of Medicine, University of Southampton; Southampton UK
6. Department of Genetic Medicine; Belfast City Hospital; Belfast UK
7. Department of Clinical Genetics; Guy's and St. Thomas' Hospital NHS Trust; London UK
8. Department of Clinical Genetics, University Hospitals of Leicester NHS Trust; Leicester Royal Infirmary; Leicester UK
9. East Anglian Medical Genetics Service, Clinical Genetics; Cambridge University Hospitals NHS Foundation Trust; Cambridge UK
10. Centre de Génétique Humaine; Institut de Pathologie et de Génétique (I.P.G.); Gosselies (Charleroi) Belgium
11. DDD Study; Wellcome Trust Sanger Institute; Hinxton, Cambridge UK
12. MRC Human Genetics Unit, Institute of Genetics and Molecular Medicine (I.G.M.M.); University of Edinburgh; UK