Columbia University - Department of Neurology, Columbia University - Department of Neurology, University of Pittsburgh - Department of Psychiatry, New York State Institute for Basic Research in Developmental Disabilities, New York State Institute for Basic Research in Developmental Disabilities, Columbia University - Department of Neurology, University of North Texas, Washington University in St. Louis - Department of Neurology, University of Pittsburgh, Harvard University - Department of Neurology, Harvard University - Department of Neurology, Washington University in St. Louis - Department of Neurology, University of California, Irvine, University of California, Irvine, University of Wisconsin - Madison - Departments of Medical Physics and Psychiatry, University of Wisconsin-Madison, University of Cambridge, University of California, Irvine, University of California, Irvine, Columbia University - Mailman School of Public Health, University of California, Irvine, School of Medicine, Department of Pediatrics, Columbia University - Departments of Epidemiology and Neurology, University of Pittsburgh - Department of Psychiatry, Columbia University - Departments of Epidemiology and Neurology and Independent