Funding for this research was provided by:
Text and Data Mining valid from 2019-06-20
Received: 21 January 2019
Accepted: 9 June 2019
First Online: 20 June 2019
Compliance with Ethical Standards
: The authors declare no conflicts of interest.
: This article does not contain any studies with human participants or animals performed by any of the authors.
: All co-authors have agreed to submission and we state that the results have neither previously been made publicly available, nor are they under consideration for publication elsewhere.