1. Department of Radiology and Biomedical Imaging, University of California, San Francisco, San Francisco, CA 94158, USA.
2. Department of Bioengineering and Therapeutic Sciences, University of California, San Francisco, San Francisco, CA 94158, USA.
3. Department of Pathology, University of California, San Francisco, San Francisco, CA 94158, USA.
4. Department of Neurological Surgery, University of California, San Francisco, San Francisco, CA 94158, USA.