Text and Data Mining valid from 2018-05-29
Received: 25 December 2017
Accepted: 20 April 2018
First Online: 29 May 2018
Ethics approval and consent to participate
: The manuscript reports research which does not require any approval by ethics committee(s).
: The authors declare that they have no competing interests.
: All contributing authors declare their consent for the final accepted version of the manuscript to be considered for publication in the journal EPJ Data Science.