1. Pain Relief and Palliative Care Unit, Department of Radiology, Areteion Hospital, School of Medicine; University of Athens; Athens; Greece
2. Radiology Department, Areteion Hospital, School of Medicine; University of Athens; Athens; Greece
3. Second Department of Surgery, Areteion Hospital; University of Athens Medical School; Athens; Greece
4. Areteion Hospital, School of Medicine; University of Athens; Athens; Greece