Published on in Vol 7, No 1 (2018): January
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/7918, first published
.
![The Use of Facebook Advertising to Recruit Healthy Elderly People for a Clinical Trial: Baseline Metrics The Use of Facebook Advertising to Recruit Healthy Elderly People for a Clinical Trial: Baseline Metrics](https://asset.jmir.pub/assets/b3875ac7663861aee2cd6f93e4bd6a32.jpeg 480w,https://asset.jmir.pub/assets/b3875ac7663861aee2cd6f93e4bd6a32.jpeg 960w,https://asset.jmir.pub/assets/b3875ac7663861aee2cd6f93e4bd6a32.jpeg 1920w,https://asset.jmir.pub/assets/b3875ac7663861aee2cd6f93e4bd6a32.jpeg 2500w)
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