1. 3rd Department of Orthopaedic Surgery, KAT Hospital, 145 61 Athens, Greece
2. Department of Physiotherapy, KAT Hospital, 145 61 Athens, Greece
3. 4th Department of Orthopaedic Surgery, KAT Hospital, 145 61 Athens, Greece
4. Laboratory for Research of the Musculoskeletal System, National and Kapodistrian University, KAT Hospital, 145 61 Athens, Greece