All of the following are important general guidelines for the selection of a control group in a case-control study, EXCEPT:
a. controls should be selected without regard for exposure status
b. controls should be representative of the source population from which the cases were derived
c. controls should represent persons who would have been identified as a case if they had developed the disease
d. controls should only be a friend, spouse, relative, or neighbor of the case
Ans: d
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A _________ _________ is a statement that there is no difference between the groups that are sampled from
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