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*Department of Environmental Health Sciences, Johns Hopkins University, Baltimore, Maryland, and †Department of Epidemiology and Preventive Medicine, University of Maryland School of Medicine, Baltimore, Maryland Correspondence: Ellen K. Silbergeld, PhD, Johns Hopkins University, Bloomberg School of Public Health, Environmental Health Sciences, 615 N. Wolfe Street, Baltimore, MD 21205. E-mail: [email protected]
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Silbergeld et al. (2002) studied this question.
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