1. Department of Palliative Medicine, Faculty of Medicine and University Hospital, University of Cologne, Koln, Germany.
2. Department I of Internal Medicine, Faculty of Medicine and University Hospital, University of Cologne, Koln, Germany.
3. Faculty of Medicine and University Hospital, University of Cologne, Center for Integrated Oncology Cologne Aachen Bonn Cologne Duesseldorf (ABCD), Koln, Germany.
4. Faculty of Medicine and University Hospital, University of Cologne, Center for Health Services Research (ZVFK), Koln, Germany.