Ogawa, Takeshi
Takao, Masaki
Hamada, Hidetoshi
Sakai, Takashi
Sugano, Nobuhiko
Article History
Received: 3 November 2017
Accepted: 16 March 2018
First Online: 27 March 2018
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: 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.