Hanning, Uta
Sporns, Peter Bernhard
Schmidt, Rene
Niederstadt, Thomas
Minnerup, Jens
Bier, Georg
Knecht, Stefan
Kemmling, André
Article History
Received: 8 June 2017
Accepted: 30 September 2017
First Online: 20 October 2017
Conflict of interests
: U. Hanning, P. Sporns, R. Schmidt,T. Niederstadt, J. Minnerup,G. Bier, S. Knecht and A. Kemmling declare that they have no competing interests.