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Open-Access License: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: https://creativecommons.org/licenses/by/4.0/legalcode. This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Address correspondence to this author at the 2 Department of Orthopaedic Surgery, Aristotle University of Thessaloniki, “G. Gennimatas” Hospital, 546 35, Thessaloniki, Greece; Tel: 00302310963270; Fax: 00302310968265; E-mail: sferopoulos@yahoo.com