Kobayashi, Makoto http://orcid.org/0000-0003-0219-9108
Article History
Received: 7 January 2018
Accepted: 20 May 2018
First Online: 28 May 2018
Compliance with ethical standards
:
: The author declares that he has no conflict of interest.
: 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.
: For this type of study formal consent is not required.