Published on in Vol 20, No 7 (2018): July
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/9113, first published
.
1 Inserm U1018, Center for Research in Epidemiology and Population Health, Villejuif, France
2 Université Paris-Sud, Orsay, France
3 Université de Versailles-Saint-Quentin-en-Yvelines, Versailles, France