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Ptacek, J., Dolick, K., & Mattson, M.  (2017, September 26). Advocacy Groups as Agents for Change in Health and Risk Messaging. Oxford Research Encyclopedia of Communication. Retrieved 16 Oct. 2019, from https://oxfordre.com/communication/view/10.1093/acrefore/9780190228613.001.0001/acrefore-9780190228613-e-228.