Welcome to the GREAT Study Researcher Portal! - your resource for sharing and collaboration with other GREAT researchers. The portal system is designed to keep our researchers informed and to help facilitate many of the important GREAT research activities. Via the portal, you will find agendas, memos, manuals, reports, contact information for collaborating researchers and you can easily keep your schedule synchronized with the GREAT calendar. We hope you will find the portal easy to use. If you have questions, need assistance or wish to make suggestions, please communicate with the Coordinating Center through the GREAT Help Center.