Published on in Vol 22, No 7 (2020): July
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/17502, first published
.
![Biased Sampling and Causal Estimation of Health-Related Information: Laboratory-Based Experimental Research Biased Sampling and Causal Estimation of Health-Related Information: Laboratory-Based Experimental Research](https://asset.jmir.pub/assets/85969b54faf3c1b7cb679c94ec447d84.png 480w,https://asset.jmir.pub/assets/85969b54faf3c1b7cb679c94ec447d84.png 960w,https://asset.jmir.pub/assets/85969b54faf3c1b7cb679c94ec447d84.png 1920w,https://asset.jmir.pub/assets/85969b54faf3c1b7cb679c94ec447d84.png 2500w)
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