Published on in Vol 21, No 8 (2019): August
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/13382, first published
.
1 Department of General Internal Medicine and Psychosomatics, Heidelberg University, Heidelberg, Germany
2 Department of General Practice and Health Services Research, Heidelberg University, Heidelberg, Germany