Takagi, Hideaki
Arimura, Keiichi
Uto, Tomofumi
Fukaya, Tomohiro
Nakamura, Takeshi
Choijookhuu, Narantsog
Hishikawa, Yoshitaka
Sato, Katsuaki
Article History
Received: 11 November 2015
Accepted: 30 March 2016
First Online: 14 April 2016
Competing interests
: The authors declare no competing financial interests.