tion. In addition, she is active in the American Heart Association and the Society for Nutrition Education. She has a bachelor's degree in nutrition and dietetics from the University of Maryland and is a registered dietitian.

RAYMOND F. BURK, M.D., is Director of the Clinical Nutrition Research Unit and professor of medicine and pathology at Vanderbilt University. It was also at Vanderbilt that Dr. Burk received his M.D. Dr. Burk has been involved in research on the nutritional and metabolic significance of selenium for many years. He has participated in five workshops sponsored by the National Cancer Institute and has been a member of three World Health Organization task groups on selenium. He was awarded the Lederle Award in Human Nutrition in 1988 and the Osborne and Mendel Award in 1993. He sits on the editorial boards of Hepatology and the American Journal of Clinical Nutrition.

ALICIA L. CARRIQUIRY, Ph.D., is an associate professor in the Department of Statistics at Iowa State University. She has a Ph.D. in statistics and animal science from Iowa State. Since 1990, Dr. Carriquiry has been a consultant for the U.S. Department of Agriculture Human Nutrition Information Service. She has also done consulting for the U.S. Environmental Protection Agency, the National Pork Producers Council, and is an affiliate for the Law and Economics Consulting Group. At present, Dr. Carriquiry is investigating the statistical issues associated with the Third National Health and Nutrition Examination Survey (NHANES III) and she has recently completed reports on improving the USDA 's food intake surveys and methods to estimate adjusted intake, and biochemical measurement distributions for NHANES III. Dr. Carriquiry is the President Elect of the International Society for Bayesian Analysis, a fellow of the American Statistical Association, and an elected member of the International Statistical Institute. She is editor of Statistical Science, and serves on the Executive Committee of the Board of Directors of the National Institute of Statistical Science and of the Institute of Mathematical Statistics. Her research interests include nutrition and dietary assessment, Bayesian methods and applications, mixed models and variance component estimation, environmental statistics, stochastic volatility, and linear and nonlinear filtering.

ALVIN C. CHAN, Ph.D., is a professor in the Department of Biochemistry, Microbiology and Immunology, Faculty of Medicine, at the University of Ottawa, Ontario, Canada. Dr. Chan received both

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