Kawada, Tomoyuki http://orcid.org/0000-0002-4426-4644
Article History
Received: 26 June 2018
Accepted: 2 July 2018
First Online: 20 July 2018
Compliance with ethical standards
:
: The author declares that he has no conflict of interest.
: This article does not contain any studies with human or animal subjects performed by any of the authors.
: For this type of study formal consent is not required.