Xu, Peng
Yang, Jiaheng
Liu, Min
He, Xiaodong
Zeng, Yong
Wang, Kunpeng
Wang, Jin
Papoular, D. J.
Shlyapnikov, G. V.
Zhan, Mingsheng
Article History
Received: 16 February 2015
Accepted: 11 June 2015
First Online: 22 July 2015
Competing interests
: The authors declare no competing financial interests.