Published on in Vol 8 , No 5 (2020) :May
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/15909, first published
.

1 Research Institutes of Sweden AB, Göteborg, Sweden
2 Clinical Epidemiology Division, Department of Medicine Solna, Karolinska Institutet, Stockholm, Sweden