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A group of people are exposed to a certain environmental toxin for a certain amount of time. They are not treated. A study is performed by observing them over a certain amount of time to determine the potential effect of that toxin.
What is the type of this study?
A- Prospective
B- Retrospective
C- Double blinded
D- Longitudinal
E- Cross-sectional
Answer: http://medical-usmle.com/?p=8018
 
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