Which type of epidemiological study played an important role in initially identifying the risk factors that lead to AIDS?

Question

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Retrospective studies are designed to look back in time to identify possible risk factors or causes for a disease or health outcome. In the case of AIDS, retrospective studies played an important role in initially identifying risk factors such as unprotected sexual contact with a person who has HIV or intravenous drug use as significant factors in the development of AIDS.

Which Type of Epidemiological Study Played an Important Role in Initially