Tsukada, Setsuro
Masaoka, Yuri
Yoshikawa, Akira
Okamoto, Keiji
Homma, Ikuo
Izumizaki, Masahiko
Article History
Received: 3 December 2015
Accepted: 12 April 2016
First Online: 27 April 2016
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 research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.