1. McKusick-Nathans Institute of Genetic Medicine; Department of Pediatrics, Johns Hopkins University School of Medicine; Baltimore MD
2. Pediatric Neurology; Johns Hopkins University School of Medicine; Baltimore MD
3. Carolinas Pediatric Neurology Care; Charlotte NC
4. Department of Molecular and Human Genetics; Baylor Miraca Genetics Laboratories, Baylor College of Medicine; Houston TX
5. Carolinas Pathology Group; Charlotte NC
6. Genetics and Molecular Biology Branch, National Human Genome Research Institute, National Institutes of Health; Bethesda MD