Okamoto, Masahiro
Yamashita, Mariko
Ogata, Nahoko
Article History
Received: 8 September 2017
Revised: 7 February 2018
Accepted: 19 February 2018
First Online: 1 March 2018
Compliance with ethical standards
:
: The authors declare that they have no competing interests.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national 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.