. 2020 Mar 11;8(3):e15390. doi: 10.2196/15390
©Jing Li, Li Sun, Yaogang Wang, Lichuan Guo, Daiqing Li, Chang Liu, Ning Sun, Zheng Xu, Shu Li, Yunwen Jiang, Yuan Wang, Shunming Zhang, Liming Chen. Originally published in JMIR mHealth and uHealth (http://mhealth.jmir.org), 11.03.2020.
This is an open-access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work, first published in JMIR mHealth and uHealth, is properly cited. The complete bibliographic information, a link to the original publication on http://mhealth.jmir.org/, as well as this copyright and license information must be included.
Figure 2.
Mirror histograms. (A) Before match. (B) After match.