1. University of Cologne, Faculty of Human Sciences & Faculty of Medicine and University Hospital Cologne, Institute of Medical Sociology, Health Services Research, and Rehabilitation Science, Cologne, Germany
2. Department of Palliative Medicine, University Hospital Bonn, Bonn, Germany
3. Department of Palliative Medicine, Medical Faculty RWTH Aachen University, Aachen, Germany
4. Department of Palliative Medicine, CIO Aachen Bonn Cologne Düsseldorf, University of Cologne, Faculty of Medicine and University Hospital Cologne, Cologne, Germany