Barry S. Levy, MD, MPH, is Adjunct Professor of Public Health, Tufts University School of Medicine, Boston, MA. David H. Wegman, MD, MSc, is Dean, School of Health and Environment, University of Massachusetts Lowell. Sherry L. Baron, MD, MPH, is Coordinator, Priority Populations and Occupational Health Disparities, National Institute for Occupational Health and Safety, Bethesda, MD. Rosemary K. Sokas, MD, MOH, is Professor, Environmental and Occupational Health Sciences, University of Illinois at Chicago School of Public Health.