. 2020 Sep 7;8(9):e22321. doi: 10.2196/22321
©Ichiro Nakamoto, Sheng Wang, Yan Guo, Weiqing Zhuang. Originally published in JMIR mHealth and uHealth (http://mhealth.jmir.org), 07.09.2020.
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Figure 1.
Color schema of the quick response codes: (A) green; (B) orange.