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Authors
Omiya, Yoshie
Ichikawa, Shintaro
Satoh, Yoko
Motosugi, Utaroh
Nakajima, Nobuaki
Onishi, Hiroshi
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Article History
First Online: 25 July 2018
Compliance with ethical standards
:
: No external funding was received for this study.
: All authors 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 research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: Informed consent was waived the requirement because of the retrospective study design.
