1. Department of Anesthesiology, Pain and Palliative Medicine, Radboud University Medical Center, Nijmegen, The Netherlands
2. Department of Radiotherapy-Oncology and Palliative Medicine, University Hospital Leuven, Leuven, Belgium
3. Academic Unit of Supportive Care, School of Medicine and Biomedical Sciences, University of Sheffield, Sheffield, UK
4. Palliative Care Centre, Department of Palliative Medicine, Malteser Hospital Bonn/Rhein-Sieg, University of Bonn, Bonn, Germany
5. Department of Palliative Medicine, Georg-August-University of Göttingen, Göttingen, Germany
6. Department for Health Evidence, Radboud University Medical Center, Nijmegen, The Netherlands