1. Department of Neurosurgery, University of California Los Angeles (UCLA), Los Angeles, California, United States
2. Department of Neurosurgery, University of Texas Southwestern Medical Center, Dallas, Texas, United States
3. Department of Neurosurgery, Harbor UCLA Medical Center, Torrance, United States
4. Department of Pathology, Harbor UCLA Medical Center, Torrance, United States
5. Department of Radiology, Harbor UCLA Medical Center, Torrance, United States
6. Department of Pathology, UCLA, Los Angeles, California, United States.