Jun, Sung-Hoon
Hirata, Akira
Kanai, Tamotsu
Santangelo, Thomas J.
Imanaka, Tadayuki
Murakami, Katsuhiko S.
Article History
Received: 6 June 2014
Accepted: 2 September 2014
First Online: 14 October 2014
Competing interests
: The authors declare no competing financial interests.