1. National Genetics Reference Laboratory (Manchester), St. Mary’s Hospital, Manchester, United Kingdom.
2. UKNEQAS for Molecular Genetics Scheme Organiser, The Institute of Human Genetics, The International Centre for Life, Central Parkway, Newcastle upon Tyne, United Kingdom.
3. Wessex Regional Genetics Laboratory, Salisbury District Hospital, Salisbury, United Kingdom.
4. Regional Molecular Genetics Laboratory, Liverpool Women’s Hospital, Liverpool, United Kingdom.
5. Radboud University Nijmegen Medical Centre, Department of Human Genetics, Nijmegen, The Netherlands.
6. Diagnostic Molecular Pathology Laboratory, UCLA Medical Center, Los Angeles, California.
7. National Centre for Medical Genetics, Our Lady’s Hospital for Sick Children, Crumlin, Dublin, Ireland.
8. Clinical Molecular Genetics Laboratory, Department of Medical Genetics, Yorkhill NHS Trust, Glasgow, United Kingdom.