1. Danish Pain Research Center; Aarhus University; Denmark
2. Departments of Anesthesiology and Pharmacology; Columbia University College of Physicians and Surgeons; New York; USA
3. Centre d'Evaluation et de Traitement de la Douleur; Institut National de la Santé et de la Recherche Médicale (Inserm) U-987; Hôpital Ambroise Paré; Boulogne-Billancourt and Université Versailles Saint-Quentin en Yvelines; Paris; France
4. Division of Neurological Pain Research and Therapy; Department of Neurology; Universitätsklinikum Schleswig-Holstein; Kiel; Germany
5. Department of Neurosurgery; Helsinki University Central Hospital; Finland
6. Department of Molecular Medicine and Surgery; Karolinska Institute; Pain Center; Department of Anesthesiology and Intensive Care; Karolinska University Hospital; Stockholm; Sweden
7. Division of Pain Medicine; Department of Anesthesiology and Critical Care Medicine; Johns Hopkins University School of Medicine; Baltimore; USA
8. Section of Anaesthetics, Pain Medicine and Intensive Care; Faculty of Medicine; Imperial College London; UK
9. Klinische Psychologie und Psychotherapie; Philipps-Universität Marburg; Germany
10. California Pacific Medical Center Research Institute; Pain Clinical Research Center; University of California San Francisco; USA
11. Department of Neurology; Mount Sinai School of Medicine; New York; USA
12. Center for Biomedicine and Medical Technology Mannheim and Medical Faculty; Heidelberg University; Mannheim; Germany