1. Cancer Prevention Institute of California, Berkeley, California 94704, United States
2. Environmental Chemistry Laboratory, Department of Toxic
Substances Control, Berkeley, California 95812, United States
3. Food and Drug Laboratory Branch, California Department
of Public Health, Richmond, California 94804, United States
4. Department of Population Sciences, Beckman Research Institute of the City of Hope, Duarte, California 91010, United States
5. Department of Epidemiology, School of Medicine, University of California Irvine, Irvine, California 92697, United States
6. Stanford University School of Medicine, Department of Health Research and Policy, Stanford, California 94305, United States