1. Department of Neurosurgery, The University of Utah, Salt Lake City, Utah, United States
2. Department of Neurosurgery, Cleveland Clinic, Cleveland, Ohio, United States
3. Department of Neurosurgery, University of Pittsburgh, Pittsburgh, Pennsylvania, United States
4. Department of Neurosurgery, Washington University in Saint Louis, Saint Louis, Missouri, United States
5. Department of Neurological Surgery, University of Pittsburgh, Pittsburgh, Pennsylvania, United States
6. Department of Neurological Surgery, Thomas Jefferson University, Philadelphia, Pennsylvania, United States
7. Department of Neurosurgery, Pacific Neuroscience Institute, Los Angeles, California, United States
8. Department of Neurological Surgery, The Ohio State University Wexner Medical Center, Columbus, Ohio, United States
9. Department of Neurosurgery, University of California, Los Angeles (UCLA), Los Angeles, California, United States
10. Department of Neurosurgery, University of Southern California, Los Angeles, California, United States
11. Barrow Clinical Outcomes Center, Barrow Neurological Institute, Phoenix, Arizona, United States
12. Department of Neurosurgery, Barrow Neurological Institute, Phoenix, Arizona, United States