1. UK NEQAS for Molecular Genetics, Department of Laboratory Medicine; Royal Infirmary of Edinburgh; Edinburgh UK
2. West Midlands Regional Genetics Laboratory; Birmingham Women's NHS Foundation Trust; Birmingham UK
3. North East Thames Regional Genetics Laboratory; Great Ormond Street Hospital; London UK
4. CEQAS, John Radcliffe Hospital; Oxford University Hospitals NHS Foundation Trust; Oxford UK
5. Genetics Department, Viapath Analytics; Guy's Hospital; London UK
6. EMQN, Manchester Centre for Genomic Medicine, St Mary's Hospital; Manchester University Hospitals NHS Foundation Trust; Manchester UK
7. Department of Clinical Genetics; VU University Medical Center Amsterdam; Amsterdam The Netherlands
8. UCL Great Ormond Street Institute of Child Health and Great Ormond Street NHS Foundation Trust; London UK