Published on in Vol 6, No 6 (2018): June
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/10701, first published
.
1 TIC Salut Social, Generalitat de Catalunya, Mataró, Barcelona, Spain
2 Centre for Research in Health and Economics, Department of Experimental and Health Sciences, Universitat Pompeu Fabra, Barcelona, Spain
3 Universitat de Vic – Universitat Central de Catalunya, Vic, Spain