1. Department of Palliative Medicine, University Hospital Essen, University of Duisburg-Essen, Essen, Germany
2. Department of Psychosomatic Medicine and Psychotherapy, University of Duisburg-Essen, Essen, Germany
3. Interdisciplinary Centre of Palliative Medicine, University Hospital Düsseldorf, Heinrich-Heine-University, Düsseldorf, Germany
4. Department of Anesthesiology, University Hospital Düsseldorf, Heinrich-Heine-University, Düsseldorf, Germany
5. Center of Emergency Medicine, University Hospital Essen, Essen, Germany
6. West German Cancer Centre, Department of Medical Oncology, University Hospital Essen, University of Duisburg-Essen, Essen, Germany