PLE-7378

As an epidemiologist, you are asked to recommend the type of study appropriate for researchers who would like to study the causes of a rare form of glycogen storage disease. They have discovered a registry of the disease and have access to a large database of patients, which unfortunately is only a few years old. They have funding for only 1 year from the National Institutes of Health, and the budget will be limited. What type of study design will you recommend?