1. Department of Molecular Genetics, Royal Devon & Exeter NHS Foundation Trust, Exeter, United Kingdom.
2. Institute of Biomedical and Clinical Science, Peninsula Medical School, Exeter, United Kingdom.
3. East Anglian Medical Genetics Service, Addenbrooke's Hospital, Cambridge, United Kingdom.
4. DNA Laboratory, Guy's & St. Thomas' NHS Foundation Trust, London, United Kingdom.
5. National Genetics Reference Laboratory (Wessex), Salisbury District Hospital, Salisbury, United Kingdom.
6. National Genetics Reference Laboratory (Manchester), St Mary's Hospital, Manchester, United Kingdom.