Nakao, Shota
Ishikawa, Kazuo http://orcid.org/0000-0002-9930-9555
Ono, Hidefumi
Kusakabe, Kenji
Fujimura, Ichiro
Ueno, Masato
Idoguchi, Koji
Mizushima, Yasuaki
Matsuoka, Tetsuya
Funding for this research was provided by:
General Insurance Association of Japan (10-1-23)
Article History
Received: 10 March 2017
Accepted: 12 January 2018
First Online: 24 January 2018
Compliance with ethical standards
:
: Shota Nakao, Kazuo Ishikawa, Hidefumi Ono, Kenji Kusakabe, Ichiro Fujimura, Masato Ueno, Koji Idoguchi, Yasuaki Mizushima, and Tetsuya Matsuoka declare that they have no conflict of interest.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. This study was approved by our institutional ethics board (#28-17). Written formal consent is not required for this retrospective study.