Ohfuji, S. http://orcid.org/0000-0002-6096-6881
Article History
Received: 14 October 2017
Accepted: 5 February 2018
First Online: 16 February 2018
Compliance with ethical standards
:
: The author declares that he has no competing interests.
: All applicable international, national, and/or institutional guidelines for the care and use of animals were followed.