Published on in Vol 6, No 4 (2018): April
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/9189, first published
.
1 Institut National de la Recherche Agronomique, Alimentation et Sciences Sociales Unité de Recherche 1303, University of Paris Saclay, Ivry sur Seine Cedex, France
2 Institute for Research on Socio-Economic Inequality, University of Luxembourg, Esch-sur-Alzette, Luxembourg