1. Curriculum in Toxicology and Environmental Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA
2. Division of the National Toxicology Program (DNTP), NTP Laboratory, National Institute of Environmental Health Sciences (NIEHS), National Institutes of Health (NIH), Research Triangle Park, North Carolina, USA
3. Nicholas School of the Environment, Duke University, Durham, North Carolina, USA
4. Cellular and Molecular Pathology Branch, National Toxicology Program (NTP), National Institute of Environmental Health Sciences, Research Triangle Park, North Carolina, USA
5. Exposure Methods and Measurements Division, National Exposure Research Laboratory, Office of Research and Development (ORD), U.S. EPA, Research Triangle Park, North Carolina, USA