1. Nicholas School of the Environment (C.D.K.), Duke University, Durham, North Carolina 27708;
2. Department of Animal Sciences (J.J.B.), University of Florida, Gainesville, Florida 32611;
3. D. H. Barron Reproductive and Perinatal Biology Research Program (J.J.B.), University of Florida, Gainesville, Florida 32611;
4. Department of Obstetrics, Gynecology and Women's Health (K.C.K., C.-X.M.,V.D.B., C.J.I., S.C.N.), University of Missouri, Columbia, Missouri 65211;
5. Department of Pediatrics (A.W.), Johns Hopkins University School of Medicine, Baltimore, Maryland 21287;
6. Department of Biology (RTZ), University of Massachusetts Amherst, Amherst, Massachusetts 01003;
7. Division of Biological Sciences (V.D.B., S.C.N.), University of Missouri, Columbia, Missouri 65211;
8. United States Geological Survey (D.E.T.), Columbia Environmental Research Center, Columbia, Missouri 65201