1. Department of Neurosurgery, Neurosurgery Teaching Hospital, Baghdad, Iraq
2. Department of Surgery, University of Baghdad, College of Medicine, Baghdad, Iraq
3. Department of Surgery, Al-Nahrain University, College of Medicine, Baghdad, Iraq
4. Department of Family Medicine, Faculty of Medicine and Pharmacy, Mohammed I University, Oujda, Morocco
5. Department of Surgery, Medical College of Georgia, Augusta, Georgia
6. Department of Surgery, Dow University of Health Sciences, Karachi, Pakistan
7. Department of Neurosurgery, University of Cincinnati, United States
8. Department of Neurosurgery, University of Pittsburgh, Pittsburgh, United States