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Khosropour, C. M., Johnson, B. A., Ricca, A. V., & Sullivan, P. S. (2013). Enhancing Retention of an Internet-Based Cohort Study of Men Who Have Sex with Men (MSM) via Text Messaging: Randomized Controlled Trial. Journal of Medical Internet Research, 15, Article ID: e194.
http://dx.doi.org/10.2196/jmir.2756
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