Published on in Vol 7, No 1 (2019): January
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/11898, first published
.
![Physical Activity Surveillance Through Smartphone Apps and Wearable Trackers: Examining the UK Potential for Nationally Representative Sampling Physical Activity Surveillance Through Smartphone Apps and Wearable Trackers: Examining the UK Potential for Nationally Representative Sampling](https://asset.jmir.pub/assets/79119d4d819dcfa9d1ba049ad2b59a74.png 480w,https://asset.jmir.pub/assets/79119d4d819dcfa9d1ba049ad2b59a74.png 960w,https://asset.jmir.pub/assets/79119d4d819dcfa9d1ba049ad2b59a74.png 1920w,https://asset.jmir.pub/assets/79119d4d819dcfa9d1ba049ad2b59a74.png 2500w)
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