Ono, Hiroaki http://orcid.org/0000-0002-7550-8162
Article History
Received: 30 January 2018
Accepted: 16 April 2018
First Online: 20 April 2018
<!--Emphasis Type='Bold' removed-->Compliance with ethical standards
:
: The author declares that no conflict of interest exists.
: This article does not discuss any studies with human participants performed by the author.
: No identifying information about the individuals is included in the paper.