Li, D. L.
Ma, Q. L.
Wang, S. G.
Ward, R. C. C.
Hesjedal, T.
Zhang, X.-G.
Kohn, A.
Amsellem, E.
Yang, G.
Liu, J. L.
Jiang, J.
Wei, H. X.
Han, X. F.
Article History
Received: 12 October 2014
Accepted: 11 November 2014
First Online: 2 December 2014
Competing interests
: The authors declare no competing financial interests.