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Supported by grants from the National Institute on Aging of the National Institutes of Health (P01 AG017553 and P01 AG022064) and by the Louisiana Board of Regents through the Millennium Trust Health Excellence Fund [HEF(2001-06)-02]. We thank the people of Georgia and Louisiana for participation in our study. We acknowledge the valuable recruitment, data acquisition, data management, and fiscal management efforts of M. Burgess, K. Grier, E. Jackson, E. McCarthy, K. Shaw, L. Strong, S. Reynolds, S. Anderson, E. Cassidy, M. Janke, T. Savla, M. Durden, M. Cervantes, D. Rouzan, and T. Beard.

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