1 Neurological Surgery, Radiology, Mechanical Engineering, and Stroke & Applied Neuroscience Center, University of Washington, Seattle, Washington, USA mlevitt@neurosurgery.washington.edu.
2 Mechanical Engineering, Neurological Surgery, and Stroke & Applied Neuroscience Center, University of Washington, Seattle, Washington, USA.
3 Department of Neurosurgery, Stony Brook University, Stony Brook, New York, USA.