Clinical trials are an important part of etiological studies, these studies are done to compare one treatment or medication to another.

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Etiological Studies also called Analytical Studies are studies conducted around individuals and specific hypotheses on how a certain disease accumulates.

Etiological Studies

Clinical Trials

Observational studies are studies that are uncontrolled or natural studies. These studies exist when there's a health risk already present that epidemiologists can study the effects of. 

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