1. Department of Materials Science and Engineering, University of Washington, Seattle, Washington 98195, United States
2. Department of Neurological Surgery, University of Washington, Seattle, Washington 98195, United States
3. Clinical Research Division, Fred Hutchinson Cancer Research Center, Seattle, Washington 98109, United States
4. Department of Biochemistry, University of Washington, Seattle, Washington 98195, United States
5. Department of Radiology, University of Washington, Seattle, Washington 98195, United States