1. Pain Research, Department of Surgery and Cancer , Imperial College London , London , UK
2. Division of Neurological Pain Research and Therapy, Department of Neurology , University Hospital of Schleswig-Holstein , Campus Kiel , Kiel , Germany
3. Department of Anaesthesiology, Intensive Care and Pain Medicine , University Hospital Muenster , Muenster , Germany
4. Neurophysiology , Mannheim Center of Translational Neuroscience (MCTN), Medical Faculty Mannheim, Heidelberg University , Heidelberg , Germany