Funding for this research was provided by:
Japan Society for the Promotion of Science (No. 25870499, No. 15K10450)
Japan Orthopaedics and Traumatology Foundation (No. 263)
Received: 22 March 2018
Accepted: 25 June 2018
First Online: 3 July 2018
Ethics approval and consent to participate
: All procedures performed in studies involving human participants were in accordance with the ethical standards of our institution and the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. This study was approved by the Institutional Review Board (IRB) of Kyushu University (IRB number 24–55). The subject was given informed consent to participate in this IRB approved study and was informed of the risk of radiation exposure required.
: Not applicable.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.