1. University of Texas Southwestern Medical Center, University of Texas Southwestern Medical Center, Dallas, Texas.
2. Department of Neuropsychology, Children's Medical Center, Dallas, Texas.
3. Department of Psychiatry, University of Texas Southwestern Medical Center, Dallas, Texas.
4. Department of Clinical Research, Children's Medical Center, Dallas, Texas.
5. Department of Pediatrics, University of Texas Southwestern Medical Center, Dallas, Texas.
6. Department of Neurology, University of Texas Southwestern Medical Center, Dallas, Texas.