1. Division of Neurosurgery, Department of Surgery, University of Alberta and the University of Alberta Hospital, Edmonton, Alberta, Canada.
2. Faculty of Medicine, Jazan University, Jazan, Saudi Arabia.
3. Department of Family and Community Medicine, College of Medicine, King Saud University, Riyadh, Saudi Arabia.
4. John W. Scott Health Sciences Library, Walter C. Mackenzie Health Sciences Centre, University of Alberta, Edmonton, Alberta, Canada.
5. School of Public Health, Edmonton Clinic Health Academy, University of Alberta, Edmonton, Alberta, Canada.
6. Division of Neurosurgery, Department of Surgery, University of Alberta, Edmonton, Alberta, Canada.
7. Department of Critical Care Medicine, University of Alberta, Edmonton, Alberta, Canada.