Ito, Hideki
Usui, Akihiko
Uchida, Wataru
Mutsuga, Masato
Article History
Received: 8 June 2018
Revised: 16 August 2018
Accepted: 17 August 2018
First Online: 17 September 2018
Compliance with ethical standards
:
: The authors declare that there is 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.
: Informed consent was obtained from all individual participants included in the study.