. 2017 Sep 15;5(9):e132. doi: 10.2196/mhealth.8242
©Hong Yu, Feng Gao, Liren Jiang, Shuoxin Ma. Originally published in JMIR Mhealth and Uhealth (http://mhealth.jmir.org), 15.09.2017.
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Figure 2.
Typical hardware setup (left) and user interface (right).