Before revision: Confirmation The Six Cities Study was followed (and its findings effectively confirmed) by a much bigger epidemiological project, generally referred to as the American Cancer Society (ACS) study, which was carried out by three authors of the original study (Pope, Dockery, and Frank E. Speizer) and four other collaborators.
After revision: Confirmation The Six Cities study was followed (and its findings effectively confirmed) by a much bigger epidemiological project, generally referred to as the American Cancer Society (ACS) study, which was carried out by three authors of the original study (Pope, Dockery, and Frank E. Speizer) and four other collaborators.