1. Department of Anesthesiology Universitätskliniken des Saarlandes Homburg/Saar Germany
2. Department of Pain Medicine Ruhr‐Universität Bochum Bochum Germany
3. Department Internal and Integrative Medicine Kliniken Essen‐Mitte Faculty of Medicine University of Duisburg‐Essen Essen Germany
4. Health Care Center for Pain Medicine and Mental Health Saarbrücken Germany
5. Department Psychosomatic Medicine and Psychotherapy Technische Universität München München Germany