Elster, Fabian
Barkhofen, Sonja
Nitsche, Thomas
Novotný, Jaroslav
Gábris, Aurél
Jex, Igor
Silberhorn, Christine
Article History
Received: 22 April 2015
Accepted: 13 July 2015
First Online: 27 August 2015
Competing interests
: The authors declare no competing financial interests.