Published on in Vol 4, No 9 (2020): September
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/19138, first published
.
![Phone Calls to Retain Research Participants and Determinants of Reachability in an African Setting: Observational Study Phone Calls to Retain Research Participants and Determinants of Reachability in an African Setting: Observational Study](https://asset.jmir.pub/assets/d1f86302b4305f809fab39268781d261.png 480w,https://asset.jmir.pub/assets/d1f86302b4305f809fab39268781d261.png 960w,https://asset.jmir.pub/assets/d1f86302b4305f809fab39268781d261.png 1920w,https://asset.jmir.pub/assets/d1f86302b4305f809fab39268781d261.png 2500w)
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