1. Department of Nursing, University of West Attica, 12243 Egaleo, Greece
2. Pain Relief and Palliative Care Unit, Department of Radiology, Areteion Hospital, School of Medicine, National and Kapodistrian University of Athens, 11526 Athens, Greece
3. Department of Nursing, Hellenic Mediterranean University, 71410 Heraklion, Greece
4. Laboratory for Research of the Musculoskeletal System, School of Medicine, National and Kapodistrian University of Athens, 14561 Athens, Greece