Funding for this research was provided by:
European Commission, within the ICT Policy Support Programme of the Competitiveness and Innovation Framework Programme (620983)
Received: 19 December 2019
Accepted: 26 June 2020
First Online: 3 July 2020
Ethics approval and consent to participate
: Ethics approval was obtained from the Euskadi Ethics Committee (CEIC PI2014200). All participants provided their written informed consent.
: Not applicable.
: The authors declare that they have no competing interests.