1. Department of Neurosurgery, University of Baghdad, College of medicine, Baghdad, Iraq,
2. Department of Neurosurgery, University of Louisville, Louisville, Kentucky, United States,
3. Department of Neurosurgery, Neurosurgery Teaching Hospital, Baghdad, Iraq,
4. Department of Neurosurgery, Alfaisal University, College of Medicine, Riyadh, Saudi Arabia,
5. Department of Neurosurgery, University of Al-Mustansiriya, College of Medicine, Baghdad, Iraq,
6. Department of Neurosurgery, University of Mansoura, College of Medicine, Mansoura, Egypt,
7. Department of Neurosurgery, University of Cincinnati, Cincinnati, United States.