bn:03665879n
Noun Concept
AR
دراسة الحالات والشواهد  الحالات والشواهد  دراسات الحالات والشواهد  دراسات مراقبة حالة
EN
A case–control study is a type of observational study in which two existing groups differing in outcome are identified and compared on the basis of some supposed causal attribute. Wikipedia
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