6 Mar 2018

Which of the following describes a cohort epidemiological study? Choose one: A. An investigator enrolls a group of people with a disease and a control group of people without disease. B. An investigator identifies geographical areas or population groups that have high rates, or elevated risks, for a particular disease. C. An investigator compares a new vaccine against a placebo in two groups of patients. D. An investigator observes whether each participant is exposed to an agent and then notes whether each develops disease.

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Keith Leannon
Keith LeannonLv2
9 Mar 2018

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