Knöss, Werner
van de Velde, Marco
Sandvos, Catherine
Cremer-Schaeffer, Peter
Article History
First Online: 5 June 2019
Compliance with ethical guidelines
:
: W. Knöss, M. van de Velde, C. Sandvos, and P. Cremer-Schaeffer declare that they have no competing interests.
: For this article no studies with human participants or animals were performed by any of the authors. All studies performed were in accordance with the ethical standards indicated in each case.