Ding, Jun
Arigong, Bayaner
Ren, Han
Zhou, Mi
Shao, Jin
Lu, Meng
Chai, Yang
Lin, Yuankun
Zhang, Hualiang
Article History
Received: 27 June 2014
Accepted: 31 July 2014
First Online: 22 August 2014
Competing interests
: The authors declare no competing financial interests.