Kraus, Hannes
Heiber, Michael C.
Väth, Stefan
Kern, Julia
Deibel, Carsten
Sperlich, Andreas
Dyakonov, Vladimir
Article History
Received: 2 June 2015
Accepted: 15 June 2016
First Online: 6 July 2016
Competing interests
: The authors declare no competing financial interests.