1. North Thames Genomic Laboratory Hub Great Ormond Street NHS Foundation Trust London UK
2. UCL Great Ormond Street Institute of Child Health London UK
3. Department of Obstetrics and Gynecology Georgetown University Hospital Washington DC
4. Antenatal Testing Center Inova Alexandria Hospital Alexandria VA
5. Department of Obstetrics and Gynaecology University of Leuven Leuven Belgium and the Institute for Women's Health, UCL, London
6. Fetal Medicine Unit and Ontario Fetal Centre, Department of Obstetrics and Gynaecology Mount Sinai Hospital and University of Toronto Toronto Ontario Canada
7. Division of Personalized Genomic Medicine Columbia University Medical Center & the New York Presbyterian Hospital New York New York USA
8. Department of Obstetrics and Gynaecology University of Melbourne Victoria Australia
9. Mercy Hospital for Women Heidelberg Victoria Australia
10. Murdoch Children's Research Institute Parkville Victoria Australia
11. The Northern Hospital Epping Victoria Australia
12. Division of Prenatal Genomics and Fetal Therapy, Medical Genomics and Metabolic Genetics Branch, National Human Genome Institute National Human Genome Institute, National Institutes of Health Bethesda Maryland USA