1. Center of Musculoskeletal Surgery, Department of Trauma Charité University Hospital, 13353 Berlin, Germany.
2. Department of Trauma and Orthopaedics, Academic Unit, Clarendon Wing, Floor A, Leeds General Infirmary, Great George Street, Leeds LS1 3EX, UK.
3. Academic Unit, Trauma & Orthopaedic Surgery University of Crete, 1 Pindarou Street, 71305 Heraklion, Crete, Greece.