1. Mayo Clinic Medical Scientist Training Program, Mayo Clinic, Rochester, Minnesota 55905, United States
2. Department of Neurologic Surgery, Mayo Clinic, Rochester, Minnesota 55905, United States
3. Mayo Clinic Graduate School of Biomedical Sciences, Mayo Clinic, Rochester, Minnesota 55905, United States
4. Department of Biomedical Engineering, Mayo Clinic, Rochester, Minnesota 55905, United States