Published on in Vol 22, No 10 (2020): October
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/14783, first published
.
1 Department of Health Promotion, Care and Public Health Research Institute, Faculty of Health Medicine and Life Sciences, Maastricht University, Maastricht, Netherlands
2 International Trade, Statistics Netherlands, Heerlen, Netherlands