Tada, Takuya
Zhang, Yanzhao
Koyama, Takayoshi
Tobiume, Minoru
Tsunetsugu-Yokota, Yasuko http://orcid.org/0000-0002-1168-8846
Yamaoka, Shoji
Fujita, Hideaki
Tokunaga, Kenzo
Article History
Received: 1 July 2015
Accepted: 27 August 2015
First Online: 2 November 2015
Competing interests
: The authors declare no competing financial interests.