. 2018 Apr 16;7(4):e101. doi: 10.2196/resprot.8071
©Jose Luis Ibarra, Jessica Marie Agas, Melissa Lee, Julia Lily Pan, Alison Meredith Buttenheim. Originally published in JMIR Research Protocols (http://www.researchprotocols.org), 16.04.2018.
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Figure 2.
Cost per completed survey compared with the number of completed quality surveys by platform, 2017.