1. Department of Physical Medicine and Rehabilitation, Baylor College of Medicine, Houston, Texas.
2. Department of Diagnostic Imaging, Texas Children's Hospital, Houston, Texas.
3. Departments of Psychology and Neuroscience, Brigham Young University, Provo, Utah.
4. Departments of Radiology and Psychiatry, University of Utah, Salt Lake City, Utah.
5. Departments of Psychology, Brigham Young University, Provo, Utah.
6. Geriatric Research, Education, and Clinical Center, Boston VA Healthcare System and Harvard Medical School, Boston, Massachusetts.
7. Departments of Physical Medicine and Rehabilitation, Neurosurgery, and Psychiatry, Baylor College of Medicine, Houston, Texas.