Halu, Arda http://orcid.org/0000-0001-6217-790X
De Domenico, Manlio http://orcid.org/0000-0001-5158-8594
Arenas, Alex http://orcid.org/0000-0003-0937-0334
Sharma, Amitabh http://orcid.org/0000-0003-0632-4690
Article History
Received: 17 May 2018
Accepted: 21 February 2019
First Online: 23 April 2019
Competing interests
: The authors declare no competing interests.