Acquired aneurysmal subarachnoid hemorrhage is a condition that is characterized by bleeding into the subarachnoid space surrounding the brain. It is a very rare disease with a low prevalence and incidence in the United States. You are an expert epidemiologist and you are asked to give advice on what type of study design you would use to conduct a study on the possible association between several potential exposures and acquired aneurysmal subarachnoid hemorrhage. Which study design would you suggest and why ?