Funding for this research was provided by:
Bundesministerium für Bildung und Forschung (01EH1603B)
Text and Data Mining valid from 2019-04-08
First Online: 8 April 2019
Compliance with Ethical Standards
: This study was funded by the German Federal Ministry of Education and Research (Grant no.: 01EH1603B).
: Carina Oedingen and Tim Bartling were funded by the German Federal Ministry of Education and Research. The funding source had no role in the study and no influence on the data collection and analyses, interpretation of the results or writing of the publication. Axel C. Mühlbacher, Harald Schrem and Christian Krauth have no conflicts of interest that are directly relevant to the content of this article.
: All data generated or analysed during this study are included in this published article and its Electronic Supplementary Material.