Published on in Vol 8, No 4 (2019): Oct-Dec
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/12225, first published
.
1 Hannover Medical School, Institute for Epidemiology, Social Medicine and Health Systems Research, Hannover, Germany
2 Freiburg University of Education, Department of Public Health and Health Education, Freiburg, Germany