1. Division of Clinical and Metabolic Genetics, Department of Pediatrics, The Hospital for Sick Children University of Toronto Toronto Ontario Canada
2. The Prenatal Diagnosis and Medical Genetics Program, Department of Obstetrics and Gynecology, Mount Sinai Hospital University of Toronto Toronto Ontario Canada
3. Department of Gynecology and Obstetrics and Department of Genetic Medicine Johns Hopkins Hospital Baltimore Maryland USA
4. Department of Gynecology and Obstetrics, Center for Fetal Therapy Johns Hopkins Hospital Baltimore Maryland USA
5. Department of Pediatrics University of Rochester Rochester New York USA
6. Department of Pediatrics, Pediatric Genomics Discovery Program Yale University School of Medicine New Haven Connecticut USA
7. Department of Pathology and Laboratory Medicine University of Rochester Medical Center Rochester New York USA
8. Division of Maternal Fetal Medicine Sibley Memorial Hospital, Johns Hopkins Medicine Washington Washington USA
9. Department of Pathology and Laboratory Medicine, CHEO Genetics Diagnostic Laboratory University of Ottawa Ottawa Ontario Canada
10. Department of Pathology and Laboratory Medicine, Mount Sinai Hospital University of Toronto Toronto Ontario Canada