1. Genetic Medicine, Manchester Academic Health Science Centre, University of Manchester and Central Manchester University Hospitals NHS Foundation Trust. St Mary's Hospital, Manchester, UK
2. Clinical Genetics Service, Nottingham University Hospitals NHS Trust, Nottingham, UK
3. Genetic Health Services Victoria, Royal Children's Hospital, Parkville, Victoria, Australia
4. Department of Paediatrics, University of Melbourne, Melbourne, Victoria, Australia
5. Murdoch Childrens Research Institute, Royal Children's Hospital, Melbourne, Victoria, Australia
6. Human Genetics, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands
7. Medical Genetics, Belfast City Hospital, Belfast, UK
8. South West Thames Regional Genetics Service, St George's Hospital, London, UK
9. South East Thames Regional Genetics Service, Guy's Hospital, London, UK
10. Department of Medical Genetics, Sydney Children's Hospital, Randwick, New South Wales, Australia
11. Departement Menselijke Erfelijkheid, Katholieke Universiteit Leuven, Leuven, Belgium
12. Our Lady's Hospital for Sick Children, Crumlin, Dublin, Ireland