Baylor College of Medicine - Howard Hughes Medical Institute, Baylor College of Medicine - Department of Molecular and Human Genetics, Baylor College of Medicine - Department of Molecular and Human Genetics, Baylor University - Jan and Dan Duncan Neurologic Research Institute, Baylor College of Medicine - Department of Molecular and Human Genetics, Baylor College of Medicine - Howard Hughes Medical Institute, Harvard University - Department of Psychology, Baylor College of Medicine - Department of Molecular and Human Genetics, Washington University in St. Louis - Division of Neuropathology, Washington University in St. Louis - Division of Neuropathology, Baylor College of Medicine - Department of Molecular and Human Genetics, Baylor College of Medicine - Department of Molecular and Human Genetics, Washington University in St. Louis - Division of Neuropathology, Baylor College of Medicine - Department of Molecular and Human Genetics, Independent, Cincinnati Children's Hospital Medical Center - Division of Human Genetics, University of Cincinnati - Department of Pediatrics, Cincinnati Children's Hospital Medical Center - Division of Human Genetics, University of Cincinnati - Department of Pediatrics, University of Cincinnati - Department of Pediatrics, Baylor College of Medicine - Department of Molecular and Human Genetics, Johns Hopkins University - Division of Neurogenetics, Johns Hopkins University - Division of Neurogenetics, Seoul National University - Department of Biomedical Sciences, Washington University in St. Louis - Department of Neurology, Seoul National University - Department of Biomedical Sciences, Washington University in St. Louis - Department of Neurology, Baylor College of Medicine - Department of Molecular and Human Genetics, Seoul National University - Department of Pediatrics, Cincinnati Children's Hospital Medical Center - Division of Human Genetics, Seoul National University - Department of Pediatrics, University of Chicago - Section of Rheumatology and Baylor College of Medicine - Department of Molecular and Human Genetics