Niwa, Naoya
Yoshida, Tadashi
Mizuno, Ryuichi
Kikuchi, Eiji
Miyajima, Akira
Hayashi, Matsuhiko
Oya, Mototsugu
Article History
Received: 29 July 2017
Accepted: 15 November 2017
First Online: 27 November 2017
Compliance with ethical standards
:
: None to report.
: The authors have declared that no conflict of interest exists.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional review board at Keio University Hospital (IRB Approval Number: 20130424) and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.
: The informed consent was waived by the institutional review board at Keio University Hospital, since the patients had left the institution at the time of the study and the study subjects were de-identified.