LETTER TO THE EDITOR |
Antonia M. Calafat, PhD
Centers for Disease Control and Prevention
Atlanta, GA 30333
Catherine J. Karr, MD, PhD
Departments of Occupational and Environmental Health Sciences and Pediatrics
University of Washington
Seattle, WA 98115-8160
Paula Lozano, MD, MPH
Department of Pediatrics
University of Washington
Seattle, WA 98115-8160
Elizabeth Brown, PhD
Department of Biostatistics
University