1. Department of Neurosurgery, University of Southern California Keck School of Medicine, Los Angeles, California;
2. Department of Neurosurgery, Oregon Health & Science University, Portland, Oregon;
3. Department of Neurosurgery, University of California, San Diego, California;
4. Goodman Campbell Brain and Spine, Department of Neurosurgery, Indiana University, Indianapolis, Indiana;
5. Department of Neurosurgery, University of Cincinnati College of Medicine, Cincinnati, Ohio;
6. Geisinger Health System, Wilkes-Barre, Pennsylvania;
7. Department of Neurosurgery, Medical College of Wisconsin, Milwaukee, Wisconsin;
8. Department of Neurosurgery, Littleton Adventist Hospital, Littleton, Colorado;
9. Central Illinois Neuro Health Science, Bloomington, Illinois; and
10. Department of Neurosurgery, University of Tennessee Health Science Center, Memphis, Tennessee