Text and Data Mining valid from 2018-07-04
Received: 16 January 2018
Accepted: 23 April 2018
First Online: 4 July 2018
Ethics approval and consent to participate
: Not applicable.
: Dominic P Laverty, Robert Kelly and Owen Addison declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.