1. Department of Neurosurgery, Hamad General Hospital, Doha, Qatar
2. College of Medicine, University of Baghdad, Baghdad, Iraq
3. Department of Neurology, VA Commonwealth University, Richmond, VA, USA
4. Neurosurgery Department, Holy Family Red Crescent Medical College, Dhaka, Bangladesh
5. Department of Neurosurgery, Saarland University Hospital, Homburg, Germany