1 Department of Orthopaedic Surgery, University of Ioannina, Ioannina, Greece.
2 Department of Orthopaedic Surgery, University of Ioannina, Ioannina, Greece; Department of Orthopedics, University of Pennsylvania, Philadelphia, PA, USA. Electronic address: npaschos@cc.uoi.gr.
3 Orthopaedic Department of General Hospital of Arta, Arta, Greece.