Question: If the investigators randomly select the control group from all participants at the baseline of the cohort study (all the participants are still at the

If the investigators randomly select the control group from all participants at the baseline of the cohort study (all the participants are still at the risk of developing disease, meaning we do not know their disease status), what control sampling approach are the investigators using?

options:

Incidence density sampling

Cumulative sampling

Case-cohort sampling

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