RICHARD B. JOHNSTON, JR. (Chair), Senior Vice President for Program and Medical Director,

The March of Dimes Birth Defects Foundation, White Plains, New York;

Adjunct Professor of Pediatrics,

Yale University School of Medicine, New Haven, Connecticut

E. RUSSELL ALEXANDER, Chief of Epidemiology,

Seattle-King County Health Department, Seattle, Washington;

Professor of Epidemiology,

School of Public Health and Community Medicine, University of Washington

RICHARD T. JOHNSON,* Professor and Director,

Department of Neurology, The Johns Hopkins University School of Medicine, Baltimore, Maryland

MICHAEL S. KRAMER, Professor,

Departments of Pediatrics and of Epidemiology and Biostatistics, McGill University Faculty of Medicine, Montreal, Quebec, Canada

BENNETT A. SHAYWITZ, Professor,

Department of Pediatrics, Neurology and Child Study Center, and Chief of Pediatric Neurology, Yale University School of Medicine, New Haven, Connecticut

PAUL D. STOLLEY,* Professor and Chairman,

Department of Epidemiology and Preventive Medicine, University of Maryland School of Medicine, Baltimore, Maryland

Kathleen R. Stratton, Project Director

Cynthia J. Howe, Program Officer

Dorothy R. Majewski, Project Assistant

Michael A. Stoto, Director,

Division of Health Promotion and Disease Prevention

Michael A. Edington, Managing Editor

Michael K. Hayes, Contract Editor