1. Department of Neurosurgery, University of South Alabama, Mobile, Alabama, USA;
2. Department of Political Science, University of South Alabama, Mobile, Alabama, USA;
3. Twin Cities Spine Center, Minneapolis, Minnesota, USA;
4. Department of Neurosurgery, University of Arizona—Phoenix, Phoenix, Arizona, USA;
5. East Coast Orthotics, New York, New York, USA;
6. Neurosurgeons of New Jersey, Ridgewood, New Jersey, USA;
7. Department of Neurosurgery, NYU Grossman School of Medicine, New York, New York, USA