1. University Hospitals Bristol NHS Trust/University of Bristol; Bristol United Kingdom
2. Guy's and St Thomas’ NHS Trust; London United Kingdom
3. North West Thames Regional Genetics Service; Harrow; London United Kingdom
4. Manchester Centre For Genomic Medicine; St Mary's Hospital Manchester; United Kingdom
5. Institute of Human Development; University of Manchester; Manchester United Kingdom
6. Teesside Genetics Unit; The James Cook University Hospital; Middlesbrough United Kingdom
7. Wessex Clinical Genetics Service; Southampton United Kingdom
8. Liverpool Women's NHS Trust; Liverpool United Kingdom
9. Genetic Health Service NZ; Christchurch Hospital; Christchurch New Zealand
10. Genetic Health Service NZ; Auckland Hospital; Auckland New Zealand
11. Bristol Genetics Laboratory; North Bristol NHS Trust; Bristol United Kingdom
12. West of Scotland Department of Clinical Genetics; Glasgow; United Kingdom
13. Royal Devon and Exeter Hospital; Exeter United Kingdom
14. Northern Ireland Regional Genetics Service; Belfast City Hospital; Belfast Ireland
15. South West Thames Clinical Genetics Service; St Georges Hospital; London United Kingdom
16. Northern Genetics Service; Newcastle Upon Tyne United Kingdom
17. West Midlands Regional Genetics Service; Birmingham United Kingdom
18. MRC Human Genetics Unit; MRC Institute of Genetics and Molecular Medicine; University of Edinburgh; Edinburgh United Kingdom