Published on in Vol 21, No 10 (2019): October
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/12514, first published
.
1 Chair for Public Health and Health Services Research, Research Unit for Biopsychosocial Health, Department of Medical Informatics, Biometry and Epidemiology, Ludwig-Maximilians-Universität München, Munich, Germany
2 Blindness and Deafness Prevention, Disability and Rehabilitation, World Health Organization, Geneva, Switzerland