1. Department of Palliative Medicine, Center of Integrated Oncology (BMBF O1KN1106), Cologne/Bonn and Clinical Trials Unit, University Hospital of Cologne, Cologne, Germany.
2. Interdisciplinary Centre for Palliative Medicine, University Hospital, Munich, Germany.
3. Department of Palliative Care, Policy and Rehabilitation—WHO Collaborating Centre for Palliative Care and Older People, Cicely Saunders Institute, King's College London, London, United Kingdom.
4. Institute of Palliative Care, Oldenburg, Germany.