. 2018 Mar 22;20(3):e110. doi: 10.2196/jmir.9157
©André Henriksen, Martin Haugen Mikalsen, Ashenafi Zebene Woldaregay, Miroslav Muzny, Gunnar Hartvigsen, Laila Arnesdatter Hopstock, Sameline Grimsgaard. Originally published in the Journal of Medical Internet Research (http://www.jmir.org), 22.03.2018.
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Figure 3.
Percentage of devices released each year, supporting each sensor. GPS: global positioning system; PPG: photoplethysmography.