. 2017 May 1;19(5):e116. doi: 10.2196/jmir.6453
©Xingxin Zhan, Zhixia Zhang, Fang Sun, Qian Liu, Weijun Peng, Heng Zhang, Weirong Yan. Originally published in the Journal of Medical Internet Research (http://www.jmir.org), 01.05.2017.
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Figure 1.
Study flow diagram.