*Department of Orthopaedic, Athens Children’s Hospital “P. & A. Kyriakou”

†Sismanogleio General Hospital, Ά Surgical Department, Athens, Greece

We ensure you that each person listed as an author fulfill the criteria for authorship established by the International Committee of Medical Journal Editors. We insure you that all procedures performed in this study involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. Informed consent was obtained for experimentation with human subjects in this study.

The authors declare no conflict of interest.

Address correspondence and reprint requests to Panos K. Megremis, MD, A΄ Orthopaedic Department, Children’s Hospital “P. & A. Kyriakou”, Athens 11527, Greece. E-mail: [email protected].