Funding for this research was provided by:
Knut och Alice Wallenbergs Stiftelse
Svenska Forskningsrådet Formas
Text and Data Mining valid from 2018-04-20
Received: 11 October 2017
Accepted: 28 March 2018
First Online: 20 April 2018
Ethics approval and consent to participate
: The study does has not directly involved humans, animals or plants.
: Not applicable.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.