. 2014 Feb 17;2(1):e6. doi: 10.2196/mhealth.2877
©Aiguo Wang, Ning An, Xin Lu, Hongtu Chen, Changqun Li, Sue Levkoff. Originally published in JMIR mHealth and uHealth (http://mhealth.jmir.org), 17.02.2014.
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Figure 4.
Selection of apps sample in June 2011.