Published on in Vol 21, No 9 (2019): September
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/15856, first published
.
1 AmbuFlex/WestChronic, Occupational Medicine, University Research Clinic, Aarhus University, Herning, Denmark
2 Department of Clinical Epidemiology, Aarhus University Hospital, Aarhus, Denmark