1. Department of Clinical Genetics, Erasmus Medical Centre, Rotterdam, The Netherlands
2. Research Department of Genetics, Evolution and Environment, University College London, London, United Kingdom
3. Department of Human and Clinical Genetics, Leiden University Medical Centre, Leiden, The Netherlands
4. Department of Genetic Medicine, Central Manchester University Hospitals NHS Foundation Trust, Manchester, United Kingdom
5. Department of Clinical Genetics, Dartmouth–Hitchcock Medical Center, Lebanon, New Hampshire
6. Center for Human Genetics, Dresden, Germany
7. Department of Genetics, Kaiser Permanente San Jose Medical Center, San Jose, California
8. Department of Pediatrics, Duke University Medical Center, Durham, North Carolina
9. Department of Medical Genetics, St. George's Hospital, London, United Kingdom
10. Translational Medicine Division, Brigham and Womens Hospital, Boston, Massachusetts
11. Institute of Medical Genetics, Cardiff University, Heath Park, Cardiff, United Kingdom
12. Department of Molecular Genetics, Policlinica Gipuzka, San Sebastian, Spain
13. Department of Molecular Genetics, The Prince of Wales Hospital, Randwick, Australia
14. Institute of Medical Genomics, University of Valencia, Valencia, Spain
15. Department of Neurology, Children's Hospital Boston, Boston, Massachusetts