Funding for this research was provided by:
Belgian Government (ICP PhD 2014-001)
Text and Data Mining valid from 2019-01-02
Received: 17 September 2018
Revised: 15 December 2018
Accepted: 16 December 2018
First Online: 2 January 2019
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: This article does not contain any studies with human or animal subjects.