1. Department of Neurosurgery, University Hospital of Wales, Cardiff, UK (Retired)
2. Pain Specialists Australia, Richmond, Victoria, Australia
3. Hunter Pain Specialists, Broadmeadow, New South Wales, Australia
4. Department of Pain Management, Cleveland Clinic, Cleveland, Ohio, USA
5. Barolat Neurosciences, Denver, Colorado, USA
6. Mid and South Essex University Hospitals, Basildon, UK