1 Department of Neurosurgery, Medical School, Midwestern University, Glendale, United States.
2 Department of Neurosurgery, University of Baghdad, College of Medicine, Medical City, Baghdad, Iraq.
3 University of Pittsburgh Medical Center (UPMC) Stroke Institute, Department of Neurology, University of Pittsburgh Medical Center, Pennsylvania, United States.
4 Department of Neurosurgery, University of Pittsburgh, Pittsburgh, Pennsylvania, United States.