Funding for this research was provided by:
Text and Data Mining valid from 2018-04-16
First Online: 16 April 2018
Compliance with Ethical Standards
: Eline S. van der Valk, Mesut Savas, and Elisabeth F.C. van Rossum declare that they have no conflict of interest.EFCvR is supported by a Vidi grant from the Netherlands Organization of Scientific Research NWO (grant number: 91716453).
: This article does not contain any studies with human or animal subjects performed by any of the authors.