Takasaki, Kazuki http://orcid.org/0000-0001-6671-1858
Miyamoto, Morikazu http://orcid.org/0000-0003-4763-0926
Takano, Masashi http://orcid.org/0000-0001-6916-9398
Soyama, Hiroaki http://orcid.org/0000-0003-0841-7743
Aoyama, Tadashi http://orcid.org/0000-0002-5092-9729
Matsuura, Hiroko http://orcid.org/0000-0002-1825-6245
Kato, Kento http://orcid.org/0000-0003-3815-0314
Sakamoto, Takahiro http://orcid.org/0000-0003-3107-5016
Kuwahara, Mika http://orcid.org/0000-0003-1125-114X
Iwahashi, Hideki http://orcid.org/0000-0002-0139-2283
Ishibashi, Hiroki http://orcid.org/0000-0002-8745-6160
Yoshikawa, Tomoyuki http://orcid.org/0000-0002-3612-8490
Furuya, Kenichi http://orcid.org/0000-0002-1039-6235
Article History
Received: 3 January 2018
Accepted: 23 February 2018
First Online: 2 March 2018
Compliance with ethical standards
:
: All authors declare no conflict 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. For this type of study, formal consent is not required.
: Informed consent was not obtained, because our study was retrospective analysis.