Text and Data Mining valid from 2018-12-01
Received: 20 August 2018
Accepted: 9 December 2018
First Online: 29 December 2018
Ethics approval and consent to participate
: Not applicable.
: All authors consent for the publication of this review article.
: The authors declare that they have no competing interest.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.