1. 2nd Orthopaedic Department, Aristotle University of Thessaloniki, “G. Gennimatas” Hospital, Eth. Aminis 41, 546 35 Thessaloniki, Greece
2. University Hospitals Birmingham NHS Foundation Trust, Birmingham B7 5TE, UK
3. Healthcare Management, School of Social Science, Hellenic Open University, 263 35 Patra, Greece
4. School of Medicine, Faculty of Health Sciences, Aristotle University of Thessaloniki, 541 24 Thessaloniki, Greece