Funding for this research was provided by:
Text and Data Mining valid from 2019-02-01
First Online: 1 February 2019
Compliance with Ethical Standards
: Detelina Grozeva, Salha Saad, Georgina E. Menzies and Rebecca Sims each declare no potential conflicts of interest.
: This article does not contain any studies with human or animal subjects performed by any of the authors.