1 Center for Palliative and Neuro-palliative Care, Brandenburg Medical School Theodor Fontane and Faculty of Health Sciences Brandenburg, Rüdersdorf bei Berlin, Germany. Electronic address: marcelalexander.kamp@mhb-fontane.de.
2 Department of Palliative Medicine, Faculty of Medicine and University Hospital, University of Cologne, Cologne, Germany.
3 Center of Neuro-Oncology, Department of Neurosurgery, Jena University Hospital, Friedrich-Schiller-University Jena, Jena, Germany.
4 Center for Neurosurgery, Department of General Neurosurgery, Faculty of Medicine and University Hospital, University of Cologne, Cologne, Germany.
5 Institute of Medical Statistics and Computational Biology (IMSB), Faculty of Medicine and University Hospital Cologne, University of Cologne, Cologne, Germany.
6 Department of Palliative Medicine, Faculty of Medicine and University Hospital, University of Cologne, Cologne, Germany; Clinical Trials Centre Cologne (CTCC), Faculty of Medicine and University Hospital, University of Cologne, Cologne, Germany; Center for Integrated Oncology Aachen Bonn Cologne Düsseldorf (CIO ABCD), Faculty of Medicine and University Hospital, University of Cologne, Cologne, Germany; Center for Health Services Research (ZVFK), Faculty of Medicine and University Hospital, University of Cologne, Cologne, Germany.