1. Department of Neurological Surgery, University of Washington, Seattle, Washington.
2. Department of Neurology, Medical College of Wisconsin, Milwaukee, Wisconsin.
3. Department of Rehabilitation Medicine, University of Washington, Seattle, Washington.
4. Department of Psychiatry, University of California San Diego, La Jolla, California.
5. Department of Family Medicine and Public Health, University of California San Diego, La Jolla, California.
6. Department of Radiology, University of California San Francisco, San Francisco, California.
7. Department of Neurological Surgery, University of California San Francisco, San Francisco, California.
8. Department of Biostatistics, University of Washington, Seattle, Washington.