1. Department of Neurology University of Utah Salt Lake City Utah USA
2. Department of Pediatrics University of Utah Salt Lake City Utah USA
3. Department of Epidemiology University of Iowa Iowa City Iowa USA
4. Department of Neurology Virginia Commonwealth University Richmond Virginia USA
5. University of Colorado Boulder Colorado USA
6. National Center on Birth Defects and Developmental Disabilities Centers for Disease Control and Prevention Atlanta Georgia USA
7. University of South Carolina Columbia South Carolina USA
8. New York State Department of Health Albany New York USA