1. Department of Palliative Medicine, Faculty of Medicine and University Hospital, University of Cologne, Cologne, Germany.
2. Department of Psychology, Psychological Aging Research (PAR), Faculty V: School of Life Sciences, University of Siegen, Siegen, Germany.
3. Faculty of Medicine and University Hospital, Center for Integrated Oncology Aachen Bonn Cologne Duesseldorf (CIO ABCD), University Hospital Cologne, Cologne, Germany.
4. Faculty of Medicine and University Hospital, Center for Health Services Research, University of Cologne, Cologne, Germany.