1. Department of Anaesthesia and Pain Medicine, University of North Midlands NHS Trust, Staffordshire, United Kingdom
2. Department of Anesthesia and Pain Management, University of Toronto, University Health Network–Toronto Western Hospital, Toronto, Ontario, Canada
3. Institute of Health Policy Management and Evaluation, University of Toronto, University Health Network–Toronto Western Hospital, Toronto, Ontario, Canada
4. Division of Neurology, University of Toronto, Wasser Pain Management Center, Mount Sinai Hospital, Toronto, Ontario, Canada