Published on in Vol 9, No 3 (2021): March
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/27232, first published
.
![Analyzing the Essential Attributes of Nationally Issued COVID-19 Contact Tracing Apps: Open-Source Intelligence Approach and Content Analysis Analyzing the Essential Attributes of Nationally Issued COVID-19 Contact Tracing Apps: Open-Source Intelligence Approach and Content Analysis](https://asset.jmir.pub/assets/3e70895cb07ce4f4706638e92081e513.png 480w,https://asset.jmir.pub/assets/3e70895cb07ce4f4706638e92081e513.png 960w,https://asset.jmir.pub/assets/3e70895cb07ce4f4706638e92081e513.png 1920w,https://asset.jmir.pub/assets/3e70895cb07ce4f4706638e92081e513.png 2500w)
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