1. Department of Psychosomatic Medicine and Psychotherapy, University Medical Centre Hamburg-Eppendorf and Schön Klinik Hamburg Eilbek, Germany
2. Department of Clinical Psychology and Psychotherapy, University Hamburg, Germany
3. Department of Anesthesiology, University Hospital Regensburg, Germany
4. Department of Psychiatry and Psychotherapy, Section of Addiction Research and Addiction Medicine, University Hospital Tübingen, Germany
5. Department of Psychology, University of Munich and MEG-Stiftung, Germany