Wang, D.
Hlinka, J.
Bokov, A. A.
Ye, Z. -G.
Ondrejkovic, P.
Petzelt, J.
Bellaiche, L.
Article History
Received: 17 April 2014
Accepted: 28 August 2014
First Online: 5 November 2014
Competing interests
: The authors declare no competing financial interests.