Funding for this research was provided by:
Deutsche Forschungsgemeinschaft (Open Access Publishing Fund)
proFOR+ (Funding programme by Catholic University Eichstätt-Ingolstadt)
Text and Data Mining valid from 2019-05-17
Received: 13 November 2018
Accepted: 3 May 2019
First Online: 17 May 2019
Ethics approval and consent to participate
: The ethical review board of the Catholic University Eichstätt-Ingolstadt approved this study.
: Not applicable.
: The authors declare that they have no competing interests.