Question 1 / 8:  You have learned that conducting case-control studies can be difficult as they are subject to a wide variety of biases. In what circumstances would an investigator choose to conduct a case-control study?
Answer: 
If the outcome is a rare disease, such as lupus, a case-control study may be the only practical study design to identify risk factors for the disease.
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Epidemiology & Biostatistics Case-control Studies

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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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