Yamazoe, Seiji
Takano, Shinjiro
Kurashige, Wataru
Yokoyama, Toshihiko
Nitta, Kiyofumi
Negishi, Yuichi
Tsukuda, Tatsuya
Article History
Received: 2 October 2015
Accepted: 9 December 2015
First Online: 18 January 2016
Competing interests
: The authors declare no competing financial interests.