1. Department of Anesthesiology Unit of Pain Medicine Albert Schweitzer Hospital Zwijndrecht The Netherlands
2. Department of Pain and Anesthesiology The James Cook Hospital Middlesbrough U.K.
3. Department of Neurosurgery University of Illinois at Chicago Chicago Illinois U.S.A.
4. Department of Neurosurgery Poitiers University Hospital Poitiers France
5. ZNA Middelheim Antwerp Belgium
6. Department of Neurosurgery Georg‐August‐University Göttingen Göttingen Germany
7. Barolat Neuroscience Denver Colorado U.S.A.
8. Pain Center AZ Sint‐Jan Bruges Belgium
9. Carolinas Pain Institute Winston‐Salem North Carolina U.S.A.
10. Department of Anesthesiology Unit of Pain Medicine Albert Schweitzer Ziekenhuis Zwijndrecht The Netherlands
11. Radboud University Medical Centre Nijmegen The Netherlands
12. Medtronic International Trading Sarl Tolochenaz Switzerland
13. Department of Anesthesiology and Intensive Medicine General Hospital Klagenfurt Klagenfurt Austria