1. Department of Palliative Medicine, Faculty of Medicine and University Hospital, University of Cologne, Cologne, Germany
2. Faculty of Medicine, Institute of Occupational and Social Medicine and Health Services Research, University Hospital Tuebingen, Tuebingen, Germany
3. Centre for Public Health and Health Services Research, Faculty of Medicine, University Hospital Tuebingen, Tuebingen, Germany
4. Center for Integrated Oncology Aachen Bonn Cologne Duesseldorf (CIO ABCD), Faculty of Medicine and University Hospital, University of Cologne, Cologne, Germany
5. Clinical Trials Center (ZKS), Faculty of Medicine and University Hospital, University of Cologne, Cologne, Germany
6. Center for Health Services Research, Faculty of Medicine and University Hospital, University of Cologne, Cologne, Germany