. 2020 Sep 9;22(9):e19468. doi: 10.2196/19468
©Minmin Leng, Yajie Zhao, Hongmei Xiao, Ce Li, Zhiwen Wang. Originally published in the Journal of Medical Internet Research (http://www.jmir.org), 09.09.2020.
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Figure 1.
Flow diagram for search and selection of the included studies.