1. Department of Pain Medicine BG University Hospital Bergmannsheil GmbH, Ruhr University Bochum Germany
2. Department Internal and Integrative Medicine, Kliniken Essen‐Mitte, Faculty of Medicine University of Duisburg‐Essen Germany
3. Health Care Center for Pain Medicine and Mental Health Saarbrücken Germany
4. Department Internal Medicine I Klinikum Saarbrücken Germany
5. Department Psychosomatic Medicine and Psychotherapy Technische Universität München Germany