Shirai, Yasuhiro https://orcid.org/0000-0002-2058-8089
Wakabayashi, Kenjiro
Wada, Ikuo
Goto, Hideyuki
Ueki, Yoshino
Tsuchiya, Atsushi
Tsuboi, Yoshiaki
Ha, Myongsu
Otsuka, Takanobu
Article History
Received: 1 December 2017
Accepted: 20 February 2018
First Online: 9 March 2018
Compliance with ethical standards
:
: The authors declare that they have no conflicts of interest.
: All procedures followed were in accordance with the ethical standards of the responsible committee on human experimentation (institutional and national) and with the Helsinki Declaration of 1964 and later versions. This study was approved by the institutional review board of our university. The need for informed consent was waived due to the retrospective design of the study, and the fact that no patient identification data were included in the analysis.