Funding for this research was provided by:
Multimodal Computing and Interaction Cluster of Excellence at Saarland University (EXC 284-2)
Text and Data Mining valid from 2018-12-01
Received: 19 January 2018
Accepted: 29 November 2018
First Online: 29 December 2018
Ethics approval and consent to participate
: All participants gave informed consent prior to participation.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.