1. Department of Neurosurgery, College of Medicine, University of Baghdad, Baghdad, Iraq,
2. Department of Neurosurgery, University of Al-Mustansiriyah, College of Medicine, Baghdad, Iraq,
3. Department of Neurosurgery, Azerbaijan Medical University, Baku, Azerbaijan.
4. Department of Neurosurgery, University of Cincinnati, Cincinnati, Ohio, United States.
5. Department of Neurosurgery, David Geffen School of Medicine at UCLA, Center for Health Sciences, Room, United States.
6. Department of Neurosurgery, UCLA Medical Center, Los Angeles, California, United States.
7. Department of Neurosurgery, University of California, Los Angeles, California, United States.