1. Trauma & Orthopaedics, II Clinica Ortopedica e Traumatologica, IRCCS Istituto Ortopedico Rizzoli, Bologna, Italy.
2. Department of Orthopaedics, University Hospital Coventry and Warwickshire NHS Trust, Coventry, UK.
3. II Clinica Ortopedica e Traumatologica, IRCCS Istituto Ortopedico Rizzoli, Bologna, Italy.