Funding for this research was provided by:
GERL (Long-term Scholarschip)
Text and Data Mining valid from 2019-05-27
Received: 26 March 2019
Accepted: 16 May 2019
First Online: 27 May 2019
Ethics approval and consent to participate
: This research does not contain any studies on human or animals.
: All authors agreed to the publication of this manuscript.
: The authors declare no competing interests.