1. Department of Neurologic Surgery, Mayo Clinic, Jacksonville, Florida;
2. Department of Neurologic Surgery, Cleveland Clinic, Abu Dhabi, United Arab Emirates;
3. Department of Neurologic Surgery, Medical University of South Carolina, Charleston, South Carolina;
4. School of Medicine, Saint George’s University, Great River, New York;
5. Department of Radiology, Mayo Clinic, Jacksonville, Florida;
6. Department of Neurologic Surgery, Mayo Clinic, Phoenix, Arizona; and
7. Department of Radiology, Mayo Clinic, Rochester, Minnesota