. 2019 Dec 9;21(12):e15401. doi: 10.2196/15401
©Lei Zhang, Xingxing He, Yun Shen, Haoyong Yu, Jiemin Pan, Wei Zhu, Jian Zhou, Yuqian Bao. Originally published in the Journal of Medical Internet Research (http://www.jmir.org), 09.12.2019.
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Figure 1.
Study design and participant flow diagram.