Published on in Vol 7, No 12 (2018): December
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/11414, first published
.

1 Centre for Research in Health and Economics, Department of Experimental and Health Sciences, Universitat Pompeu Fabra, Barcelona , ES
2 TIC Salut Social, Generalitat de Catalunya , Mataró , ES
3 Universitat de Vic – Universitat Central de Catalunya , Vic , ES
4 IN2 , Barcelona , ES