1. Division of Medical Genetics, Departments of Medicine, Pediatrics, and Psychiatry, Center for the Health Sciences, University of California, Los Angeles 90024
2. Genetics Division, Department of Pediatrics, University of Southern California, Los Angeles County Medical Center, Los Angeles 90033
3. Division of Hematology and Oncology, Childrens Hospital of Los Angeles, Los Angeles 90054
4. Division of Ophthalmology, Childrens Hospital of Los Angeles, Los Angeles 90054
5. Medical Genetics Division, Department of Laboratory Medicine and Pathology, University of Minnesota Medical School, Minneapolis 55455