Article History
Received: 6 May 2019
Accepted: 9 July 2019
First Online: 15 July 2019
Compliance with ethical standards
:
: All authors declare that there are no conflicts of interest.
: All procedures performed in studies 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.
: This study was approved by the Institutional Review Board (IRB) of Tokyo Metropolitan Tama Medical Center (30–46), and the patient’s written informed consent was waived by the approving IRB, as this was a retrospective study.