1 King's College London - Cicely Saunders Institute of Palliative Care, Policy and Rehabilitation, London, UK; Havelhoehe Hospital, Berlin, Germany. Electronic address: pvtrott@havelhoehe.de.
2 Research Institute Havelhoehe, Berlin, Germany.
3 King's College London - Cicely Saunders Institute of Palliative Care, Policy and Rehabilitation, London, UK.