Koenen, Kathrin
Knepper, Isabell
Klodt, Madlen
Osterberg, Anja
Stratos, Ioannis
Mittlmeier, Thomas
Histing, Tina
Menger, Michael D.
Vollmar, Brigitte
Bruhn, Sven
Müller-Hilke, Brigitte
Article History
Received: 28 September 2016
Accepted: 3 February 2017
First Online: 17 March 2017
Competing interests
: The authors declare no competing financial interests.