1 Department of Neurosurgery, University of Mississippi Medical Center, Jackson, Mississippi, USA.
2 Department of Neurosurgery, University of Colorado School of Medicine, Aurora, Colorado, USA.
3 Department of Neurosurgery and Neuroscience Institute, Geisinger Health System and Geisinger Commonwealth School of Medicine, Wilkes-Barre, Pennsylvania, USA.
4 Department of Neurosurgery, University of Mississippi Medical Center, Jackson, Mississippi, USA. Electronic address: mzachariah@umc.edu.