Schütze, Friedrich
Röhrig, Florian
Vorlová, Sandra
Gätzner, Sabine
Kuhn, Anja
Ergün, Süleyman
Henke, Erik
Article History
Received: 17 June 2015
Accepted: 3 November 2015
First Online: 1 December 2015
Competing interests
: The authors declare no competing financial interests.