1. Department of Neurological Surgery, University of California, San Francisco, San Francisco, California
2. Department of Neurosurgery, Keio University, Tokyo, Japan
3. Division of Anatomic Pathology, Mayo Clinic, Rochester, Minnesota
4. Department of Biostatistics, University of California, San Francisco, San Francisco, California
5. Department of Neuroradiology, University of California, San Francisco, San Francisco, California
6. Department of Pathology, University of California, San Francisco, San Francisco, California
7. Departments of Neurological Surgery and Laboratory Medicine, University of California, San Francisco, San Francisco, California