1. Departments of Environmental Health and
2. Department of Environmental and Occupational Health, Faculty of Medicine, University of Montreal, Montreal, Quebec, Canada;
3. Departments of Neurology and
4. Pediatrics, School of Medicine, Harvard University, and Boston Children's Hospital, Boston, Massachusetts; and
5. Channing Laboratory, Department of Medicine, School of Medicine, Harvard University, and Brigham and Women's Hospital, Boston, Massachusetts
6. Epidemiology, School of Public Health, Harvard University, Boston, Massachusetts;