Jahnke, Frank
Gies, Christopher
Aßmann, Marc
Bayer, Manfred
Leymann, H. A. M.
Foerster, Alexander
Wiersig, Jan
Schneider, Christian
Kamp, Martin
Höfling, Sven
Article History
Received: 13 October 2015
Accepted: 7 April 2016
First Online: 10 May 2016
Competing interests
: The authors declare no competing financial interests.