Information linked here describes the trial, explaining how and what data were collected. Links to main trial publications, protocol documents, and external web resources can also be found here.

• Trial Summary
  This provides an overview of the study's protocol.
• Data Collected
  This includes details about protocols for questionnaires, screening, and ascertainment of cancer and mortality data.
• Biospecimens Collected
  This page describes biospecimens collected during the trial and how to apply for them.
• Main Findings
  This page provides links to publications and web sites that summarize the main findings and the design of the study.