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. Department of Nursing, Hellenic Mediterranean University, Heraklion, Greece
4. Laboratory for Research of the Musculoskeletal System, School of Medicine, National and Kapodistrian University of Athens, Athens, Greece
5. 3rd Department of Internal Medicine, General Hospital for Chest Diseases, Athens, Greece
6. Hellenic Army General Hospital, Athens, Greece