1. Department of Clinical GeneticsOdense University Hospital Odense Denmark
2. Clinical Genetics UnitWest Midlands Regional Clinical Genetics Unit Birmingham U.K. Birmingham UK
3. Sheffield Clinical Genetics ServiceNorthern General Hospital Sheffield UK
4. Institute of Medical GeneticsUniversity Hospital of Wales Cardiff UK
5. Laboratory of Medical GeneticsBambino Gesù Childrens' Hospital Rome Italy
6. Medical Genetics UnitBambino Gesù Children's Hospital Rome Italy
7. Clinical GeneticsWest of Scotland Genetic Services, the Queen Elisabeth University Hospital Glasgow UK
8. Hans Christian Andersen Children's HospitalOdense University Hospital Odense Denmark