1. Division of Genetics and Genomics and
2. Texas Department of State Health Services, Austin, Texas;
3. Division of Human Genetics, Cincinnati Children’s Hospital Medical Center, Cincinnati, Ohio;
4. Department of Neurology, Harvard Medical School, Harvard University and Boston Children’s Hospital, Boston, Massachusetts;
5. Division of Medical Genetics, Department of Pediatrics, University of Utah, Salt Lake City, Utah; and
6. Department of Genetics, University of Alabama at Birmingham, Birmingham, Alabama