1. Division of Medical Genetics; A. I. duPont Hospital for Children; Wilmington Delaware
2. Center for Applied Clinical Genomics; A. I. duPont Hospital for Children; Wilmington Delaware
3. Division of Genetics and Metabolism; Children's National Health System; Washington District of Columbia
4. Department of Genetics; Children's Hospital of Eastern Ontario; Ottawa Ontario Canada
5. Division of Medical Genetics; Stanford University; Stanford California
6. Division of Medical Genetics; Department of Pediatrics; University of Utah; Salt Lake City Utah
7. Institute of Human Genetics; University Medical Center Hamburg-Eppendorf; Hamburg Germany