1. Department of Molecular and Human Genetics Baylor College of Medicine Houston Texas USA
2. Jan and Dan Duncan Neurological Research Institute Texas Children's Hospital Houston Texas USA
3. Baylor Genetics Laboratories Houston Texas USA
4. Department of Pathology Texas Children's Hospital Houston Texas USA
5. Greenwood Genetic Center Greenwood South Carolina USA
6. Verspeeten Clinical Genome Centre London Health Sciences Centre London ON Canada
7. Department of Pathology and Laboratory Medicine Western University London ON Canada
8. Department of Genetics Texas Children's Hospital Houston Texas USA