Epidemiologists are performing a research study about the effects on the health of a community built over a toxic waste disposal location. Which other factor is needed if the study is identified as a perspective cohort study?
A) A non-exposed population for comparison
B) A detailed history of all the exposed participants
C) A group of persons who lived in the area for over a year
D) A socioeconomic profile of the non-exposed population
Correct Answer:
Verified
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