1 Department of Neurological Surgery, University of Washington, Seattle, WA, USA.
2 Department of Plastic Surgery, Northwestern University, Chicago, IL, USA.
3 Department of Rehabilitation Medicine, University of Washington, Seattle, WA, USA.
4 Department of Neurological Surgery, University of Washington, Seattle, WA, USA; Division of Engineering and Mathematics, University of Washington, Bothell, WA, USA. Electronic address: doumitt@uw.edu.