1. Medical Faculty Institute of Psychosomatic Medicine and Psychotherapy University Hospital Düsseldorf Heinrich‐Heine‐University Düsseldorf Düsseldorf Germany
2. Department of Psychosomatic Medicine and Psychotherapy Center for Health Communication and Health Services Research (CHSR) University Hospital Bonn Bonn Germany
3. Ulm University Clinic Department of Psychosomatic Medicine and Psychotherapy Comprehensive Cancer Center Ulm (CCCU) Ulm Germany
4. Department of Medical Psychology Greifswald Medical School Greifswald Germany
5. Department of Medical Psychology and Psychotherapy Comprehensive Cancer Center Mainfranken University of Würzburg Würzburg Germany
6. Comprehensive Cancer Center University Clinic Center Dresden Dresden Germany
7. Department of Psychosomatic Medicine and Psychotherapy Paracelsus Medical University General Hospital Nuremberg Nuremberg Germany
8. Department of Psychosomatic Medicine and Psychotherapy Comprehensive Cancer Center Essen (WTZ) and LVR Hospital University of Duisburg‐Essen Essen Germany
9. Charité Universitätsmedizin Berlin Corporate Member of Freie Universität Berlin Humboldt‐Universität and Berlin Institute of Health Berlin Germany
10. Department of Psychosomatic Medicine University Clinic Center Erlangen Erlangen Germany
11. Department of Psychosomatic Medicine University Clinic Center Bonn Bonn Germany
12. Department of Psychosomatic Medicine & Center Psychooncology (CePO) University Clinic Center Cologne Cologne Germany
13. University Clinic Center Frankfurt University Cancer Center Frankfurt Germany
14. Comprehensive Cancer Center University Clinic Center Tübingen Tübingen Germany
15. Department of Self‐Help Research Faculty of Medicine and Medical Center Comprehensive Cancer Center University of Freiburg Freiburg Germany