Callhoff, J.
Albrecht, K.
Hoffmann, F.
Poddubnyy, D.
Günther, K.-P.
Zink, A.
Article History
First Online: 24 July 2019
Compliance with ethical guidelines
:
: J. Callhoff, K. Albrecht, F. Hoffmann, D. Poddubnyy, K.-P. Günther and A. Zink declare that they have no competing interests.
: A positive ethics vote was issued in 2015 by the Ethics Commission of the Charité University Medicine Berlin (EA1/051/15). The investigation was conducted in accordance with national law.
: The supplement containing this article is not sponsored by industry.