Bergmann, Arno
Martinez-Moreno, Elias
Teschner, Detre
Chernev, Petko
Gliech, Manuel
de Araújo, Jorge Ferreira
Reier, Tobias
Dau, Holger
Strasser, Peter
Article History
Received: 19 June 2015
Accepted: 12 September 2015
First Online: 12 October 2015
Competing interests
: The authors declare no competing financial interests.