1. Department of Palliative Medicine, Clinical Trials Unit and Center for Integrated Oncology (CIO) Cologne/Bonn, University Hospital of Cologne, Cologne, Germany
2. Institute of Health Economics and Clinical Epidemiology (IGKE), University Hospital of Cologne, Cologne, Germany
3. Department of Palliative Care, University Hospital Freiburg, Freiburg, Germany
4. Competence Center Palliative Care Baden-Württemberg, University Medical Center Freiburg, Freiburg, Baden-Württemberg, Germany