1. Department of Neurological Surgery, Brain and Spinal Injury Center, University of California at San Francisco, San Francisco, California.
2. School of Engineering Science, Simon Fraser University, Surrey, British Columbia, Canada.
3. Taylor Collaboration, St. Mary's Medical Center, San Francisco, California.
4. Department of Mechanical Engineering, University of Delaware, Newark, Delaware.
5. College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Fort Collins, Colorado.
6. Department of Neurosciences, University of California at San Diego, San Diego, California; Veterans Administration Medical Center, La Jolla, California.
7. California National Primate Research Center, University of California at Davis, Davis, California.
8. Departments of Physiological Science and Neurology, University of California at Los Angeles, Los Angeles, California.