1. Department of Paediatrics Sheffield Children's Hospital NHS Foundation Trust Sheffield UK
2. Medical School University of Sheffield Sheffield UK
3. Department of Pediatrics Prignitz Hospital, Brandenburg Medical School Prignitz Germany
4. Department of Clinical Genetics Copenhagen University Hospital Rigshospitalet Copenhagen Denmark
5. Sheffield Diagnostic Genetics Service Sheffield Children's NHS Foundation Trust Sheffield UK
6. Department of Clinical Genetics Great Ormond Street Hospital London UK
7. Clinical Genetics Service Northwick Park Hospital London UK
8. Clinical Genetics Service St George's Hospital London UK
9. Northern Genetics Service Newcastle University Hospital NHS Trust Newcastle UK
10. Peninsula Clinical Genetics Service Royal Devon and Exeter NHS Trust Exeter UK
11. Sheffield Clinical Genetics Service Sheffield Children's NHS Foundation Trust Sheffield UK
12. Institute of Human Genetics University of Leipzig Medical Center Leipzig Germany
13. Department of Paediatrics General Hospital of Kavala Kavala Greece
14. Cardiology Department AHEPA University Hospital, Aristotle University of Thessaloniki Thessaloniki Greece
15. Department of Oncology & Metabolism University of Sheffield Sheffield UK