Case-control studies, Which of the following is not true of

Case-control studies

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Reference no: EM13327665

Which of the following is not true of case-control studies:

A. They usually use a placebo

B. Subjects choose for themselves what their exposure is

C. Subjects have the disease at the beginning of the study

D. They are shorter and need fewer subjects than other studies.

Reference no: EM13327665

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