Tang, Youcai
Obayashi, Masayuki
Niu, Fenglin
Grand, Stephen P.
Chen, Yongshun John
Kawakatsu, Hitoshi
Tanaka, Satoru
Ning, Jieyuan
Ni, James F.
Article History
Received: 15 November 2013
Accepted: 11 April 2014
First Online: 18 May 2014
Competing interests
: The authors declare no competing financial interests.