1. Pain Medicine Department of Anesthesiology University Medical Center Göttingen Göttingen Germany
2. Department Internal and Integrative Medicine Kliniken Essen‐Mitte Faculty of Medicine University of Duisburg‐Essen Essen Germany
3. Health Care Center for Pain Medicine and Mental Health Saarbrücken Germany
4. Department of Neurology University of Würzburg Würzburg Germany
5. Department Psychosomatic Medicine and Psychotherapy Technische Universität MünchenMünchen Germany