1. Department of Epidemiology, School of Public Health and Community Medicine, University of Washington, Seattle, Washington, USA
2. Department of Human Development, Cornell University, Ithaca, New York, USA
3. Cincinnati Children’s Environmental Health Center, Cincinnati Children’s Hospital Medical Center, Cincinnati, Ohio, USA
4. Department of Environmental Medicine, University of Rochester School of Medicine and Dentistry, Rochester, New York, USA
5. Trace Elements Laboratory, Wadsworth Center, New York State Department of Health, Albany, New York, USA
6. Department of Environmental Health Sciences, School of Public Health, The University at Albany, State University of New York, Albany, New York, USA
7. Division of Nutritional Sciences, Cornell University, Ithaca, New York, USA