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Case reports/series are the basic types of descriptive epidemiologic studies. The distinction between case reports and case series on the one hand, and case series and descriptive/analytic epidemiologic studies, on the other hand, is not sharp. History of medicine has demonstrated how case reports/series had generated or furthered medical knowledge in many situations. External validity and novelty are the key advantages of these studies. They act as 'screening studies' for deductivedoi:10.30834/kjp.33.1.2020.197 fatcat:3prps7oc55cghccyzl3gq4juba