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