1. Department of Anesthesiology‐Pain Unit Hospital Universitario La Paz Madrid Spain
2. Department of Pain Medicine The James Cook University Hospital Middlesbrough UK
3. Centre for Decision Analysis and Support, Ismar Healthcare Lier Belgium
4. Leeds Pain and Neuromodulation Centre Leeds Teaching Hospitals Leeds UK
5. Service de Neurochirurgie, Hôpital privé Clairval ‐ Ramsay santé Marseille France
6. Pain Management Centre, Charing Cross Hospital, Imperial College Healthcare NHS Trust London UK
7. SS. Antonio e Biagio e C. Arrigo Hospital Allesandria Piedmont Italy
8. Department of Neurosurgery University Hospital of Düsseldorf Düsseldorf Germany
9. Department of Anaesthesiology and Pain Management Rijnstate Hospital Velp The Netherlands
10. Department of Anaesthesiology and Pain Treatment Amsterdam University Medical Center Amsterdam The Netherlands
11. Department of Neurosurgery, Neurochirurgie Biberach Biberach Germany
12. Swiss Pain Institute Lausanne and Basel Switzerland
13. Pain Therapy Unit, San Giovanni‐Addolorata Hospital Rome Italy
14. Department of Anesthesiology Intensive Care, Emergency Medicine and Multidisciplinary Pain Center, Ziekenhuis Oost‐Limburg Genk Belgium
15. Department of Anesthesiology and Pain Medicine Maastricht University Medical Center Maastricht The Netherlands
16. Department of Anaesthesiology Erasmus University Medical Center Rotterdam The Netherlands