1. Department of Circulation and Medical Imaging, Norwegian University of Science and Technology
2. Department of Clinical and Molecular Medicine, Norwegian University of Science and Technology, Trondheim, Norway
3. Pain and Palliative Medicine, Shaare Zedek Medical Center, Jerusalem, Israel
4. Department of Palliative Medicine, Bristol Oncology Centre, Bristol, UK
5. Istituto Nazionale dei Tumori, Milan, Italy