Published on in Vol 9 , No 1 (2017) :Jan-Dec 2017
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/8933, first published
.

1 Centre InterUniversitaire de Recherche en Education de Lille, Education and Adult Training Department, University of Lille, Villeneuve d'Ascq, FR
2 Centre de Recherche en Education et Formation, University of Paris–Nanterre, Nanterre, FR