ogy and neurophysiology, has authored or edited 15 textbooks, is on the editorial board of several medical and scientific journals, and is editor of the journal Muscle and Nerve.

STEVEN GOODMAN, M.D., M.H.S., Ph.D., is an associate professor of oncology, pediatrics, epidemiology, and biostatistics at the Johns Hopkins School of Medicine. He trained in pediatrics at Washington University and received degrees in biostatistics and epidemiology in 1989 from Johns Hopkins University, where he is currently in the Oncology Center's Division of Biostatistics. As statistician for the Hopkins Oncology Center, General Clinical Research Center, and Pediatric Clinical Research Unit, he has participated in the design and analysis of a wide range of clinical and epidemiologic studies. He has served as statistical editor at the Annals of Internal Medicine since 1987 and has been on a variety of committees at the National Institutes of Health. His research interests include meta-analysis, statistical inference, the ethics of clinical trials, and the use of likelihood and bayesian methodology in clinical research.

ROBERT F. HERRICK, Sc.D., is a lecturer on industrial hygiene at the Harvard School of Public Health. His educational background includes a B.A. degree in chemistry from the College of Wooster, an M.S. in environmental health science from the University of Michigan, and a D.Sci. in industrial hygiene from the Harvard School of Public Health. He is certified in the comprehensive practice of industrial hygiene. His research interests are centered on the assessment of exposure as a cause of occupational and environmental disease. He has conducted research on the development of methods to measure the biologically active characteristics of reactive aerosols, and on studies of work processes in the construction and foundry industries to develop task-based models to identify and control the primary sources of worker exposures. Dr. Herrick is past chair of the American Conference of Governmental Industrial Hygienists, and past president of the International Occupational Hygiene Association. He is active in the association's mentor program, which facilitates training for occupational hygienists in industrializing countries. Prior to joining the faculty at the Harvard School of Public Health, Dr. Herrick spent 17 years at the National Institute for Occupational Safety and Health, where he conducted occupational health research.

IRVA HERTZ-PICCIOTTO, Ph.D., is associate professor in the Department of Epidemiology, School of Public Health, at the University of North Carolina at Chapel Hill. She received her Ph.D. in epidemiology from the University of California at Berkeley. She is a member of several professional societies, including the International Society for Environmental Epidemiology, for which she hosted the 1994 Annual Meeting and currently serves as president-elect. She also serves on the editorial boards of the American Journal of Epidemiology, Epidemiology, and Human and Ecological Risk Assessment. She has published extensively on

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