Takumi, Koji http://orcid.org/0000-0003-4067-2891
Hakamada, Hiroto
Nagano, Hiroaki
Fukukura, Yoshihiko
Kumagae, Yuichi
Sakai, Osamu
Yoshiura, Takashi
Article History
Received: 30 July 2020
Accepted: 1 November 2020
First Online: 19 November 2020
Compliance with ethical standards
:
: Institutional ethics review board approval was obtained, and informed consent was waived for this retrospective study.
: 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.
: The authors declare that they have no conflict of interest.