Original Contribution Lead Burden and Psychiatric Symptoms and the Modifying Influence of the d-Aminolevulinic Acid Dehydratase (ALAD) Polymorphism The VA Normative Aging Study

1 Department of Environmental Health, Harvard School of Public Health, Boston, MA. 2 Bureau of Environmental Disease Prevention, Division of Environmental Health, New York City Department of Health and Mental Hygiene, New York, NY. 3 Department of Genetics and Complex Diseases, Harvard School of Public Health, Boston, MA. 4 Center for Environmental Health and Technology, Brown University, Providence, RI. 5 The Channing Laboratory, Department of Medicine, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA. 6 Department of Neurology, Children’s Hospital, Harvard Medical School, Boston, MA. 7 Veterans Affairs Boston Healthcare System, Boston, MA. 8 Department of Epidemiology and Biostatistics, Boston University School of Public Health, Boston, MA. 9 Department of Medicine, Boston University School of Medicine, Boston, MA. 10 Department of Epidemiology, Boston University School of Public Health, Boston, MA. 11 Department of Environmental Health Sciences, University of Michigan School of Public Health, Ann Arbor, MI. 12 Division of Emergency Medicine, Children’s Hospital, Harvard Medical School, Boston, MA.