1. Department of Molecular and Human Genetics; Baylor College of Medicine; Houston Texas
2. Department of Pediatrics/Genetics Division; University of Tennessee Health Science Center Memphis; Memphis Tennessee
3. Department of Human Genetics; Maastricht University Hospital; Maastricht The Netherlands
4. Department of Pediatrics; Division of Medical Genetics; University of Mississippi Medical Center; Jackson Mississippi
5. Department of Medical Genetics; Mayo Clinic; Rochester Minnesota
6. Department of Neurology; Mayo Clinic; Rochester Minnesota
7. Department of Pediatrics; Division of Genetics and Genomic Medicine; Washington University School of Medicine; St. Louis Missouri
8. Helix; San Carlos California
9. Human Genome Sequencing Center; Baylor College of Medicine; Houston Texas
10. Department of Pediatrics; CHU Ste-Justine and University of Montreal; Montreal Canada
11. Department of Human Genetics and Donders Centre for Neuroscience; Radboud University Medical Center; Nijmegen The Netherlands