Jia, C. L.
Mi, S. B.
Barthel, J.
Wang, D. W.
Dunin-Borkowski, R. E.
Urban, K. W.
Thust, A.
Article History
Received: 10 March 2014
Accepted: 12 August 2014
First Online: 21 September 2014
Competing interests
: The authors declare no competing financial interests.