Trials that prevent or delay the onset of disease among healthy individuals are called secondary prevention trials.
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Q42: The primary purpose of the census is
Q43: Mortality data are adequate for examining nonfatal
Q44: Race and ethnicity have a profound influence
Q45: Observational studies suffer the same ethical and
Q46: Ecological studies can be done quickly and
Q48: When trials involve procedures rather than pills,
Q49: Retrospective cohort studies are considered less vulnerable
Q50: Masking guarantees comparable follow-up efforts and outcome
Q51: Which type of studies are preferable when
Q52: Which of the following depends on the
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