Hiyama, Akihiko
Katoh, Hiroyuki
Sakai, Daisuke
Tanaka, Masahiro
Sato, Masato
Watanabe, Masahiko
Article History
Received: 6 May 2019
Accepted: 22 July 2019
First Online: 31 July 2019
Ethics approval and consent to participate
: The Committee on Ethics and the Institutional Review Board of Tokai University School of Medicine approved the study protocol (18R-321). This study was retrospective research study, and the requirement for informed consent was waived.
: Not applicable.
: The authors AH, HK, DS, MS, MT and MW declare that they have no competing interests.