Text and Data Mining valid from 2019-10-28
First Online: 28 October 2019
Compliance with Ethical Standards
: The authors declare that they have no conflicts of interest.
: This paper does not report findings from an empirical study; no approval by an institutional review board was required.
: This paper does not report results from primary or secondary data analyses of studies with human participants; no informed consent was required.
: The viewpoints expressed in this paper are solely those of the authors and do not necessarily reflect the views or polices of their employers.