The average number of eggs consumed during a typical week was measured among all employees who work for a state agency. They were followed up for 3 years, and the incidence of chronic heartburn was compared at the end of the follow-up between those who consumed 0-4 eggs per week and those who consumed 5 or more eggs per week. What type of study design is it?       Randomized controlled trial     Cohort study     Quasi experimental study     Case-control study     Ecologic study

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