Question 1 / 13:  Randomized?-controlled trials are considered the most valid of the epidemiologic study designs because of what aspect of the design?
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Randomization
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Randomized Controlled Trials (RCT), Relative Risk

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Attribution:  Janet, E.A. Forrester, Kwan Ho Kenneth Chui, Steven Cohen, Michael D. Kneeland, Alice Tang, David Tybor. Epidemiology and Biostatistics 2010. (Tufts University OpenCourseWare), http://ocw.tufts.edu/Course/65/ (Accessed 3 May, 2014). License: Creative Commons BY-NC-SA
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