1. First Department of Orthopedic Surgery, National and Kapodistrian University of Athens, Attikon Hospital, Athens, Greece
2. Department of Orthopaedic Surgery, 417 Veterans Hospital (NIMTS), Athens, Greece
3. Department of Trauma and Orthopaedics, Thriasio General Hospital-NHS, Athens, Greece
4. First Department of Orthopaedics, Hygeia Hospital, Athens, Greece