Text and Data Mining valid from 2019-04-26
First Online: 26 April 2019
Compliance with Ethical Standards
: No sources of funding were used to assist in the preparation of this article.
: Linde Ceyssens, Romy Vanelderen, Christian Barton, Peter Malliaras, and Bart Dingenen declare that they have no conflicts of interest relevant to the content of this review.