1. Departement of Neurosurgery, AL-Ramadi Teaching Hospital, Al-Anbar, Iraq,
2. Departement of Neurosurgery, College of Dentistry, Al-Anbar University, Al-Anbar, Iraq,
3. Departement of Neurosurgery, College of Medicine, University of Baghdad, Iraq,
4. Departement of Neurosurgery, College of Medicine, University of Mustansiriyah, Baghdad, Iraq,
5. Department of Neurosurgery, University of Cincinnati, Cincinnati, Ohio, United States.