Tanaka, Yuki http://orcid.org/0000-0003-3346-7662
Fujimori, Motoshi http://orcid.org/0000-0003-3671-3785
Murakami, Koichi http://orcid.org/0000-0002-3184-7410
Sugimori, Hiroyuki http://orcid.org/0000-0002-7796-5113
Oki, Nozomi http://orcid.org/0000-0003-2735-9040
Aoki, Takatoshi http://orcid.org/0000-0002-7973-110X
Kamishima, Tamotsu http://orcid.org/0000-0002-7293-7471
Article History
Received: 29 June 2019
Accepted: 10 August 2019
First Online: 27 August 2019
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: Informed consent was waivered because of the retrospective study design.
: 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.