1. Department of Neurosurgery, Regina General Hospital, Regina, Canada
2. Peninsula Medical School, Universities of Exeter and Plymouth, Exeter, England
3. Department of Neurosurgery, Montreal Neurological Institute and Hospital, Montreal, Canada
4. Department of Pain and Anaesthesia, James Cook University Hospital, Middlesbrough, England
5. Department of Functional Neurosurgery, Gemelli Catholic University Hospital, Rome, Italy
6. Department of Neurosurgery, Hospital Santa Creu I Sant Pau, Barcelona, Spain
7. Pain Clinic, Basildon and Thurrock University Hospitals, Basildon, England
8. Pain Clinic, Axxon Pain Medicine, Brisbane, Australia
9. Pain Relief Unit, Rambam Medical Centre, Haifa, Israel
10. Neurosurgery, Namur Regional Hospital, Namur, Belgium
11. Pain Clinic, Morges Hospital, Morges, Switzerland
12. Pain Clinic, Varese Regional Hospital and Macchi Foundation, Varese, Italy
13. Department of Pain and Anesthesia, Bradford Hospitals, Bradford, England
14. LifeBridge Health Brain & Spine Institute, Baltimore, Maryland