Rutherford, Alex http://orcid.org/0000-0003-3717-543X
Lupu, Yonatan
Cebrian, Manuel
Rahwan, Iyad http://orcid.org/0000-0002-1796-4303
LeVeck, Brad L. http://orcid.org/0000-0002-7318-7182
Garcia-Herranz, Manuel http://orcid.org/0000-0002-4252-4975
Article History
Received: 22 June 2017
Accepted: 19 June 2018
First Online: 6 August 2018
Competing interests
: Two of the authors (A.R. and M.G.-H.) were employees of UNICEF when this work was completed.