Published on in Vol 6, No 2 (2020): Jul-Dec
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/24459, first published
.
1 University Hospital Zurich, Zurich, Switzerland
2 Biostatistics and Prevention Institute, Departments of Epidemiology and Biostatistics, University of Zurich, Zurich, Switzerland