1. Department of Neurological Surgery, University of California San Francisco, San Francisco, California, United States
2. Brain and Spinal Injury Center, Zuckerberg San Francisco General Hospital, San Francisco, California, United States
3. Department of Neurological Surgery, Columbia University Medical Center, New York, New York, United States
4. Department of Neurological Surgery, University of California San Diego, San Diego, California, United States
5. Department of Neurology, University of Utah School of Medicine, Salt Lake City, Utah, United States
6. Department of Neurological Surgery, Stanford University School of Medicine, Stanford, California, United States