What is the association between coffee drinking and risk of Parkinson’s disease?

What is the association between coffee drinking and risk of Parkinson’s disease? 

In your write-up, address each of the following points:

• Choose one of these three study designs to answer your research question: a cohort study, case-control study, or cross-sectional study. Justify why you are picking that study design. In other words, provide at least one strength of your chosen study design for addressing your chosen research question.

• Identify the target population for your study.

• Identify the source population for your study.

• How is the exposure defined in your study? When and how will it be measured?

• What are the main comparison groups of participants in your study?

• How is the main outcome defined in your study? When and how will it be measured?

• For the main outcome of interest in your study, what measure of disease frequency would be most appropriate, and why?

• What measure of association (between the exposure and outcome) would be most appropriate for your chosen study design and research question, and why?