1. Department of Neurosurgery, Clinical Neurosciences Center, University of Utah, Salt Lake City, Utah, USA;
2. School of Medicine, University of Utah, Salt Lake City, Utah, USA;
3. Department of Otolaryngology—Head and Neck Surgery, University of Utah, Salt Lake City, Utah, USA;
4. Department of Neurosurgery, Thomas Jefferson University, Philadelphia, Pennsylvania, USA;
5. Department of Neurosurgery, University of California Los Angeles, Los Angeles, California, USA;
6. Department of Neurosurgery, New York University, Lagone Medical Center, New York, New York, USA;
7. Department of Neurosurgery, Washington University School of Medicine, St. Louis, Missouri, USA;
8. Division of Endocrinology, Metabolism, & Lipid Research, Washington University School of Medicine, St. Louis, Missouri, USA;
9. Department of Neurosurgery, University of Missouri, Columbia, Missouri, USA;
10. Department of Neurosurgery, University of Pittsburgh Medical Center, Pittsburg, Pennsylvania, USA;
11. Department of Neurosurgery, The Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA;
12. Department of Neurosurgery, Barrow Neurological Institute, Phoenix, Arizona, USA;
13. Department of Neurosurgery, Providence Medical Center, Los Angeles, California, USA;
14. Department of Neurosurgery, Stanford University, Palo Alto, California, USA;
15. Department of Neurosurgery, University of Miami Miller School of Medicine, Miami, Florida, USA;
16. Department of Neurosurgery, Cleveland Clinic Foundation, Cleveland, Ohio, USA;
17. Department of Neurosurgery, University of Southern California, Los Angeles, California, USA;
18. Department of Neurosurgery, Mayo Clinic, Rochester, Minnesota, USA;
19. Department of Neurosurgery, University of Virginia, Charlottesville, Virginia, USA;
20. Global Neurosciences Institute, Philadelphia, Pennsylvania, USA;
21. Department of Neurosurgery, Drexel University College of Medicine, Philadelphia, Pennsylvania, USA