1. Department of Neurosurgery, Emergency Teaching Hospital, Duhok, Iraq,
2. College of Medicine, University of Baghdad, Baghdad, Iraq,
3. Department of Neurosurgery, Kasr Alainy School of Medicine, Research and Teaching Hospitals, Cairo University, Cairo, Egypt,
4. Department of Neurological and Spinal Surgery Service, Security Forces Hospital, Dammam, Saudi Arabia,
5. Department of Neurosurgery, University of Cincinnati, Cincinnati, Ohio, United States.