Matsuoka, Katsunari http://orcid.org/0000-0001-7067-0200
Yamada, Tetsu
Matsuoka, Takahisa
Nagai, Shinjiro
Ueda, Mitsuhiro
Miyamoto, Yoshihiro
Article History
Received: 12 February 2019
Revised: 10 March 2019
Accepted: 19 March 2019
First Online: 15 May 2019
Compliance with ethical standards
: The need for subsequent individual consent from patients whose records were evaluated was waived because the individuals were not identified in this study.
: 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.
: The authors declare that they have no conflict of interest.