Question: when incidence density sampling is used in a case control study which of the following important consideration 1 . a subject selected as a control

when incidence density sampling is used in a case control study which of the following important consideration 1. a subject selected as a control may later be selected as a case 2. a subjecr indetified as a case may later slected as a control 3. control subject must remain disease free thoughout the entire follo wup period 4. each case is matched to a sinlge control

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