. 2016 Apr 21;2(1):e14. doi: 10.2196/publichealth.5365
©Jeremy A Grey, Kyle T Bernstein, Patrick S Sullivan, David W Purcell, Harrell W Chesson, Thomas L Gift, Eli S Rosenberg. Originally published in JMIR Public Health and Surveillance (http://publichealth.jmir.org), 21.04.2016.
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Figure 2.
Equation 4.