1. Department of Palliative Medicine, University Hospital, RWTH Aachen, Germany
2. Department of Pain Management and Palliative Medicine, Medical Centre Aachen, Germany
3. Department of Palliative Medicine, University Hospital Erlangen, Germany
4. European Palliative Care Research Centre, Norwegian University of Science and Technology, Trondheim, Norway; Regional Centre of Excellence for Palliative Care, Haukeland University Hospital, Bergen, Norway
5. European Palliative Care Research Centre, Norwegian University of Science and Technology, Trondheim, Norway; Department of Oncology, St Olavs Hospital, Trondheim University Hospital, Norway
6. Department of Palliative Medicine, University Hospital Bonn and Centre for Palliative Care, Malteser Hospital Bonn/Rhein-Sieg, Germany