1. Endocrine Toxicology Branch, Toxicity Assessment Division, National Health and Environmental Effects Research Laboratory, Office of Research and Development, U.S. EPA, Research Triangle Park, NC, USA
2. Oak Ridge Institute for Science and Education (ORISE), US Department of Energy, Oak Ridge, TN, USA
3. Analytical Chemistry Branch, Biological and Economic Analysis Division, Office of Pesticide Programs, U.S. EPA, Fort Meade, MD, USA