2 Chronic Pain Education and Research, The University of Notre Dame Australia, Fremantle, WA, Australia.
3 Department of Neurosurgery, Anesthesiology and Critical Care Medicine (ret.), Johns Hopkins University School of Medicine, Baltimore, MD, United States.
4 Department of Pain Management, Cleveland Clinic, Cleveland, OH, United States.
5 Pain Rehab, Sunshine Coast, QLD, Australia.
6 Genesis Research Services, Broadmeadow, NSW, Australia.