1. Department of Orthopaedics, Evangelismos General Hospital, Athens, Greece
2. Korgialeneio Mpenakeio Hellenic Red Cross Hospital, Athens, Greece
3. Second Department of Orthopaedics, National and Kapodistrian University of Athens, School of Medicine, Athens, Greece
4. First Department of Orthopaedics, National and Kapodistrian University of Athens, Athens, Greece