cago and did a pediatric infectious diseases fellowship at the University of Minnesota Hospitals. She is certified by the American Board of Pediatrics and is a member of many professional societies, including the Pediatric Infectious Diseases Society, the Infectious Diseases Society of America, and the Society for Pediatric Research.

KAY DICKERSIN is Assistant Professor in the Department of Epidemiology and Preventive Medicine at the University of Maryland School of Medicine, Baltimore. She received her Ph.D. degree from the Johns Hopkins School of Hygiene and Public Health and did undergraduate work at the University of California in Berkeley. Her major research interests are in clinical trials, meta-analysis, and publication bias. She is particularly interested in the development and utilization of methods for the evaluation of medical care and its effectiveness. Dr. Dickersin has memberships in several professional societies and is a recipient of a number of fellowships and awards. Dr. Dickersin has also served on the Institute of Medicine Committee to Advise the Department of Defense on its FY 1993 Breast Cancer Program and the Forum on Drug Development.

RICHARD T. JOHNSON is Professor and Chair of the Department of Neurology at the Johns Hopkins University School of Medicine, Baltimore, Maryland. He received his M.D. degree from the University of Colorado School of Medicine, Denver. He is certified by the American Board of Neurology and Psychiatry and has held numerous faculty and hospital appointments and fellowships in his neurologic specialty. Dr. Johnson is a member of the Institute of Medicine as well as numerous other honorary and professional societies. He chaired the Institute of Medicine's Committee to Review an Epidemiologic Study of Neurologic Illness and Vaccination in Children. Dr. Johnson is a recipient of many awards and honors, lectures extensively, and is involved in numerous federal, nonfederal, editorial, and voluntary agencies and boards.

MICHAEL KATZ is Vice President for Research at the March of Dimes Birth Defects Foundation in White Plains, New York. He is also Carpentier Professor of Pediatrics, Emeritus, Columbia University, New York. Dr. Katz, a pediatrician, has a clinical specialty of infectious diseases and parasitology, and his research interests have dealt with host defense in malnourished children and mechanisms of latent virus infections. He is an author and coauthor of original scientific papers dealing with these subjects and, with two colleagues, an author of a textbook on parasitic diseases. Dr. Katz is a member of the Institute of Medicine and a number of professional societies, a fellow of the American Association for the Advancement of Science, and a recipient of several awards, among them the Humboldt Award for Senior U.S. Scientists, given by the German government. He has been a visiting professor in universities in the United States and abroad. He has been a consultant to the World Health Organization, the



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