Takahashi, Fuyuto
Miyamoto, Katsuhiko
Hidai, Hirofumi
Yamane, Keisaku
Morita, Ryuji
Omatsu, Takashige
Article History
Received: 2 September 2015
Accepted: 25 January 2016
First Online: 24 February 2016
Competing interests
: The authors declare no competing financial interests.