Maruyama, Shuki
Fukushima, Yasuhiro
Miyamae, Yuta
Koizumi, Koji
Article History
Received: 13 September 2017
Revised: 20 January 2018
Accepted: 25 January 2018
First Online: 10 February 2018
Compliance with ethical standards
:
: The authors report no conflicts of interest. The authors alone are responsible for the content and writing of the paper.
: This article does not contain any studies performed with human participants or animals.
: Informed consent for this study was not required, because no research involving human participants was undertaken by any of the authors.