Text and Data Mining valid from 2018-05-03
Received: 8 February 2018
Accepted: 13 March 2018
First Online: 3 May 2018
Ethics approval and consent to participate
: This is a review of previously reported studies and required no ethical approval or consent from participants.
: Not applicable.
: The funder had no role in the design or conduct of the study, collection, analysis, interpretation and management of data, preparation and review of the manuscript, or decision to submit for publication.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.