Who is participating in C4R?
C4R includes approximately 50,000 adults in the US who are already participating in one of 14 collaborating cohort studies.
Are participants from all over the US?
Participants in C4R come from across the continental United States. This map indicates the location clinical sites (blue circles, proportional to the number of participants per site), cohort coordinating centers (red), and C4R coordinating centers (yellow). The homes of participants who are examined exclusively using remote visits (i.e., without a clinical site), are shown by blue dots.