1. Department of Neurology, Mayo Clinic, Rochester, Minnesota, USA
2. Department of Neurology, University of California Davis, Sacramento, California, USA
3. Department of Speech Pathology, University of California Davis, Sacramento, California, USA
4. Department of Psychology and the Neuroscience Center, Brigham Young University, Provo, Union Territory, USA
5. Departments of Neurology and Psychiatry, University of Utah, Salt Lake City, Union Territory USA
6. Department of Neurosurgery, University of California Davis, Sacramento, California, USA