. 2015 Sep 11;4(3):e108. doi: 10.2196/resprot.4856
©Jane C Hurley, Kevin E Hollingshead, Michael Todd, Catherine L Jarrett, Wesley J Tucker, Siddhartha S Angadi, Marc A Adams. Originally published in JMIR Research Protocols (http://www.researchprotocols.org), 11.09.2015.
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Figure 1.
Illustration of 2x2 factorial design.