1. Interbalkan Medical Center of Thessaloniki, 10 Asclepiou Str., Pylaia, Thessaloniki, Greece
2. National and Kapodestrian University of Athens, KAT Hospital, 2 Nikis Str., Kifissia, Greece
3. Orthopedic Department, 251 Hellenic Air Force Hospital, Athens, Greece
4. Hygeia Hospital, 4 Erythrou Stavrou Str. & Kifisias Av, Marousi, Athens, Greece
5. Orthopaedic Department, St George, Chania General Hospital, Chania, Greece