The Stanford Five-City Project, a Major Community Trial Designed to Lower

The Stanford Five-City Project, a major community trial designed to lower the risk of cardiovascular diseases, used two types of surveys to measure treatment-control differences across risk factors. What were they?

A) Both cross-sectional surveys of households and surveys of a cohort
B) Both community surveys and focus group surveys
C) Both surveys of clinical end points and surveys of outcomes
D) Both case-control groups and surveys of cohorts