1. Department of Neurosurgery, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts, USA;
2. Neurosurgery Division, Pacific Neuroscience Institute, Santa Monica, California, USA;
3. Department of Neurosurgery, Stanford University, Stanford, California, USA;
4. Congress of Neurological Surgeons, Chicago, Illinois, USA;
5. Department of Neurosurgery, Henry Ford Medical System, Detroit, Michigan, USA;
6. Department of Neurosurgery, Emory University School of Medicine, Atlanta, Georgia, USA;
7. Department of Neurosurgery, Icahn School of Medicine at Mount Sinai, New York, New York, USA