Frenzel, Thorsten
Tienken, Milena
Abel, Merve
Berliner, Christoph
Klutmann, Susanne
Beyersdorff, Dirk
Schwarz, Rudolf
Krüll, Andreas
Bannas, Peter
Article History
Received: 30 October 2017
Accepted: 5 March 2018
First Online: 23 March 2018
Conflict of interest
: T. Frenzel, M. Tienken, M. Abel, C. Berliner, S. Klutmann, D. Beyersdorff, R. Schwarz, A. Krüll, and P. Bannas declare that they have no competing interests.