1. Cellular Neurobiology Laboratory and Department of Neurologic Surgery, Mayo Clinic, Rochester, Minnesota
2. Department of Neurologic Surgery, Mayo Clinic, Rochester, Minnesota
3. Department of Neurosurgery, Leiden University Medical Center, Leiden, the Netherlands
4. Department of Physiology and Biomedical Engineering, Mayo Clinic, Rochester, Minnesota
5. Department of Neurology, Mayo Clinic, Rochester, Minnesota
6. Department of Orthopedic Surgery, Mayo Clinic, Rochester, Minnesota
7. Departments of Physiology and Biomedical Engineering and Orthopedic Surgery, Mayo Clinic, Rochester, Minnesota
8. Cellular Neurobiology Laboratory and Department of Neurology, Mayo Clinic, Rochester, Minnesota