1. Department of Neurosurgery, University of Baghdad - College of Medicine, Baghdad, Iraq,
2. Department of Neurosurgery, Alfaisal University - College of Medicine, Riyadh, Saudi Arabia,
3. Department of Neurosurgery, Neurosurgery Teaching Hospital, Baghdad, Iraq,
4. Department of Neurosurgery, University of King Abdulaziz - College of Medicine, Jeddah, Saudi Arabia,
5. Department of Neurosurgery, University of Cincinnati, Cincinnati, Ohio, United States.