A major advantage of cohort studies over case-control studies with respect to the role of a suspected factor in the etiology of a disease is that:
a. they take less time and are less costly.
b. they permit direct estimation of risk of disease in those exposed to the suspected factor.
c. they can utilize a more representative population.
d. it is easier to obtain controls that are not exposed to the suspected factor.
e. they can be done on a double-blind basis.
Ans: b
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