Epidemiologists conduct investigations to better understand how disease

Epidemiologists conduct investigations to better understand how disease is distributed in the population and what determines who gets sick and who does not.

1. Name 2 types of studies conducted by Epidemiologists.

2. Describe each type and give an example of when these type of investigations/studies are used

3. Describe in your own works Criteria of Causation and how it relates to exposure and a suspected risk factor

Please list and compare several of the differences.