1. Department of Palliative Medicine, University Hospital Bonn, Bonn, Germany
2. Department of Palliative Medicine, University Hospital Bonn, Sigmund-Freud-Str. 25, D-53127 Bonn, Germany
3. Department of Psychology, University of Siegen, Siegen, Germany
4. Department of Palliative Medicine, University Hospital Bonn, Bonn, Germany; Malteser Krankenhaus Seliger Gerhard Bonn/Rhein-Sieg, Bonn, Germany