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Authors
Okumura, Kenichiro https://orcid.org/0000-0001-8131-7584
Ogawa, Haruhiko
Yoshie, Yuichi
Nadamura, Takahiro
Igarashi, Teturo
Tone, Kazuya
Kozaka, Kazuto
Koda, Wataru
Kobayashi, Satoshi
Gabata, Toshifumi
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Article History
Received: 5 September 2019
Revised: 11 December 2019
Accepted: 17 January 2020
First Online: 11 February 2020
Compliance with ethical standards
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: The scientific guarantor of this publication is Kenichiro Okumura.
: The authors declare that they have no conflict of interest.
: One of the authors has significant statistical expertise.
: Written informed consent was not required for this study because this study is a retrospective observational study, carried out by the opt-out method of our hospital board.
: Institutional Review Board approval was obtained.
: • retrospective• observational• performed at one institution
