1. Department of Biomedical Engineering, Hanyang University, Seoul 04763, Republic of Korea
2. Department of Neurologic Surgery, Mayo Clinic, Rochester, Minnesota 55905, United States
3. Mayo Clinic Medical Scientist Training Program, Mayo Clinic, Rochester, Minnesota 55905, United States
4. Division of Engineering, Mayo Clinic, Rochester, Minnesota 55905, United States
5. Department of Biomedical Engineering, Mayo Clinic, Rochester, Minnesota 55905, United States