1. Undergraduate Medicine, University of Manitoba, Winnipeg, Manitoba, Canada.
2. Section of Neurosurgery, Department of Surgery, University of Manitoba, Winnipeg, Manitoba, Canada.
3. Department of Human Anatomy and Cell Science, Rady Faculty of Health Sciences, University of Manitoba, Winnipeg, Manitoba, Canada.
4. Biomedical Engineering, Price Faculty of Engineering, University of Manitoba, Winnipeg, Manitoba, Canada.
5. Centre on Aging, University of Manitoba, Winnipeg, Manitoba, Canada.
6. Division of Anaesthesia, Department of Medicine, Addenbrooke's Hospital, University of Cambridge, Cambridge, United Kingdom.