Funding for this research was provided by:
European Commission (FP7-ICT- 318121)
Received: 10 April 2018
Accepted: 27 November 2018
First Online: 24 January 2019
Change Date: 7 November 2019
Change Type: Correction
Change Details: An amendment to this paper has been published and can be accessed via a link at the top of the paper.
: The authors declare no competing interests.