Kim, Youn Soo
Liu, Mingjie
Ishida, Yasuhiro
Ebina, Yasuo
Osada, Minoru
Sasaki, Takayoshi
Hikima, Takaaki
Takata, Masaki
Aida, Takuzo
Article History
Received: 8 January 2015
Accepted: 26 June 2015
First Online: 10 August 2015
Competing interests
: The authors declare no competing financial interests.