Vogt, Julia
Wernstedt, Annekatrin
Ripperger, Tim
Pabst, Brigitte
Zschocke, Johannes
Kratz, Christian
Wimmer, Katharina
Article History
Received: 31 March 2016
Revised: 12 May 2016
Accepted: 26 May 2016
First Online: 22 June 2016
Competing interests
: The authors declare no conflict of interest.