1. Department of Neurosurgery, University of Baghdad, College of Medicine, Al Risafa, Baghdad, Iraq,
2. Department of Neurosurgery, School of Medicine, Royal College of Surgeons in Ireland - Bahrain, Busaiteen, Bahrain,
3. Department of Neurosurgery, Sulaiman Al Rajhi University, College of Medicine, Al Bukayriyah, Saudi Arabia,
4. Department of Neurosurgery, Al_Iraqia University, College of Medicine, Al Risafa, Baghdad, Iraq,
5. Department of Neurosugery, Prince Sattam Bin Abdulaziz University, College of Medicine, Al Kharj - Riyadh, Saudi Arabia,
6. Department of Neurosurgery, University of Wisconsin-Madison, Wisconsin, United States
7. Department of Neurosurgery, University of Cincinnati, Cincinnati, Ohio, United States.