Gallotti, Riccardo http://orcid.org/0000-0002-8088-1973
De Domenico, Manlio http://orcid.org/0000-0001-5158-8594
Article History
Received: 13 May 2019
Accepted: 12 October 2019
First Online: 21 November 2019
Competing interests
: The authors declare no competing interests.