1. Department of Nursing, University of West Attica, Athens, Greece.
2. Pain Relief and Palliative Care Unit, Department of Radiology, Areteion Hospital, School of Medicine, National & Kapodistrian University of Athens, Athens, Greece.
3. Attikon University Hospital, School of Medicine, National & Kapodistrian University of Athens, Athens, Greece.
4. Radiotherapy Unit, Department of Radiology, Attikon University Hospital, School of Medicine, National & Kapodistrian University of Athens, Athens, Greece.