Funding for this research was provided by:
European Union’s Research Fund for Coal and Steel (RFCS) research programme (#RFCS-CT-2014-00017)
Text and Data Mining valid from 2018-11-29
Received: 30 July 2018
Accepted: 18 November 2018
First Online: 29 November 2018
Compliance with ethical standards
: The authors declare that this work is not subjected to any conflict of interest.