Ohki, Masafumi https://orcid.org/0000-0003-4334-3524
Kikuchi, Shigeru
Article History
Received: 28 December 2018
Accepted: 13 February 2019
First Online: 18 February 2019
Compliance with Ethical Standards
:
: Masafumi Ohki and Shigeru Kikuchi declare that they have no conflict of interest.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.