Führer, Amand http://orcid.org/0000-0002-8637-5692
Wienke, Andreas
Wiermann, Snezhina
Gröger, Christine
Tiller, Daniel
Article History
Received: 23 April 2019
Accepted: 7 November 2019
First Online: 19 November 2019
Ethics approval and consent to participate
: Not applicable. This article is based on secondary data only. Therefore, according to German national guidelines, no ethics approval was needed.
: Not applicable.
: The authors declare that they have no competing interests.