1. Department for Psychosomatic Medicine and Psychotherapy Center for Health Communication and Health Services Research University Hospital Bonn Bonn Germany
2. Center for Integrated Oncology Bonn (CIO) University Hospital Bonn Bonn Germany
3. Department for Psychosomatic Medicine and Psychotherapy Faculty of Medicine University Hospital Bonn Bonn Germany
4. Department of Research Methods University of Education Freiburg Germany
5. Division for Organizational Health Services Research Department of Health Services Research School of Medicine and Health Sciences Carl von Ossietzky University Oldenburg Oldenburg Germany