1. Department of Neurosurgery, Neurosurgery Teaching Hospital, Baghdad, Iraq
2. Department of Neurosurgery, College of Medicine, University of Baghdad, Baghdad, Iraq
3. Department of Neurosurgery, College of Medicine, University of Warith Al-Anbiyaa, Karbala, Iraq,
4. Department of Neurosurgery, University of Cincinnati, Cincinnati, Ohio, United States.