. 2019 Apr 18;7(4):e12081. doi: 10.2196/12081
©Yi Zhang, Liping Wang, Wenhong Yang, Dayan Niu, Chunying Li, Liling Wang, Ping Gu, Yingqian Xia, Ying Shen, Juhua Yan, Qian Zhao, Kai Mu, Weili Yan. Originally published in JMIR Mhealth and Uhealth (http://mhealth.jmir.org), 18.04.2019.
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 1.
CONSORT flow diagram.