Best of Five 2.60

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BOF: 2.60

In a prospective epidemiological study the efficacy of 2 different chemotherapeutic agents for carcinoma cervix were being compared. Cases were selected from one group of patients who have had periodic PAP smears for 3 years or more prior to diagnosis. The other group had no PAP smear history. What limitation may result from case selection?

a)     Confounding

b)      Interviewer bias

c)      Berksonian bias

d)      Lead time bias

e)      Recall bias

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