¹Department of Neurology and Danish Pain Research Center, Aarhus University Hospital, Norrebrogade 44, Building 1A, DK-8000 Aarhus C, Denmark

²Sektion für Neurologische Schmerzforschung und -therapie, Klinik für Neurologie, Universitätsklinikum Schleswig-Holstein, Campus Kiel, Kiel, Germany

³Department of Neurosurgery, Helsinki University Central Hospital, Helsinki, Finland

⁴Department of Anaesthesiology, Pain Clinic, Helsinki University, Helsinki, Finland

⁵Department of Neurological Surgery, University of Washington, Seattle, WA, USA

⁶Pain Research Group, Imperial College London, Chelsea and Westminster Hospital Campus, London, UK

⁷Chair of Neurophysiology, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany

^*Tel.: +45 8949 4137; fax: +45 8949 3269

E-mail address:[email protected]