1. Department of Neurosurgery, Yale School of Medicine, New Haven, Connecticut;
2. Department of Neurological Surgery, Weill Cornell Medicine, New York, New York;
3. Department of Neurosurgery, Mayo Clinic, Rochester, Minnesota;
4. Department of Neurological Surgery, Vanderbilt University Medical Center, Nashville, Tennessee;
5. Department of Neurosurgery, Barrow Neurological Institute, Phoenix, Arizona;
6. Department of Neurosurgery, Washington University School of Medicine, St. Louis, Missouri;
7. Department of Neurosurgery, University of Minnesota Medical School, Minneapolis, Minnesota; and
8. Department of Neurological Surgery, Oregon Health & Science University, Portland, Oregon