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Rodrigues, H., & Fonseca, M.  (2017, July 27). Viral Marketing and Exposure to Health and Risk Messages. Oxford Research Encyclopedia of Communication. Retrieved 19 Nov. 2019, from https://oxfordre.com/communication/view/10.1093/acrefore/9780190228613.001.0001/acrefore-9780190228613-e-337.