1. Department of Clinical Neuroscience and Rehabilitation, Institute of Neuroscience and Physiology, University of Gothenburg, Gothenburg, Sweden,
2. Department of Molecular and Clinical Medicine/Multidisciplinary Pain Center, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden, and
3. Multidisciplinary Pain Center, Kungälv Hospital, Kungälv, Sweden