1. Department of Psychology and Texas Institute for Measurement, Evaluation and Statistics (TIMES), University of Houston, Houston, Texas.
2. Department of Physical Medicine and Rehabilitation, Baylor College of Medicine, Houston, Texas.
3. Learning Research and Development Center, University of Pittsburgh, Pittsburgh, Pennsylvania.
4. Department of Neurological Surgery, University of Pittsburgh, Pittsburgh, Pennsylvania.
5. Department of Neurology, Baylor College of Medicine, Houston, Texas.
6. Neurology Service, Michael E. DeBakey VA Medical Center, Houston, Texas.
7. Department of Neurology, University of Utah School of Health Sciences, Salt Lake City, Utah.
8. Department of Human and Molecular Genetics, University of Utah School of Health Sciences, Salt Lake City, Utah.
9. Neurology Service, George E. Wahlen VA Medical Center, Salt Lake City, Utah.
10. Department of Psychiatry, University of Pittsburgh School of Medicine, Pittsburgh, PA.
11. Department of Pediatrics, Baylor College of Medicine, Houston, Texas.
12. Department of Psychology, University of Pittsburgh, Pittsburgh, Pennsylvania.