Quittmann, Oliver J.
Abel, Thomas
Zeller, Sebastian
Foitschik, Tina
StrĂ¼der, Heiko K.
Article History
Received: 24 December 2017
Accepted: 26 April 2018
First Online: 3 May 2018
Compliance with ethical standards
:
: The authors declare that there is no conflict of interest regarding the publication of this article.