- Correspondence to Dr Alberto Grassi, II Clinica Ortopedica e Traumatologica, Istituto Ortopedico Rizzoli, Vi aPupilli 1, Bologna 40136, Italy;
- Received April 16, 2015
- Revised December 12, 2015
- Accepted December 17, 2015
- First published January 25, 2016.
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