. 2019 Jan 3;7(1):e10371. doi: 10.2196/10371
©Ralph Maddison, Susie Cartledge, Michelle Rogerson, Nicole Sylvia Goedhart, Tarveen Ragbir Singh, Christopher Neil, Dinh Phung, Kylie Ball. Originally published in JMIR Mhealth and Uhealth (http://mhealth.jmir.org), 03.01.2019.
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Figure 2.
Number of published primary and secondary data studies by year of publication.