Published on in Vol 7, No 5 (2019): May
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/11930, first published
.
![Smartphones as Sleep Duration Sensors: Validation of the iSenseSleep Algorithm Smartphones as Sleep Duration Sensors: Validation of the iSenseSleep Algorithm](https://asset.jmir.pub/assets/2376345cc0f33965a2e6f39316ab176d.png 480w,https://asset.jmir.pub/assets/2376345cc0f33965a2e6f39316ab176d.png 960w,https://asset.jmir.pub/assets/2376345cc0f33965a2e6f39316ab176d.png 1920w,https://asset.jmir.pub/assets/2376345cc0f33965a2e6f39316ab176d.png 2500w)
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