1. Curriculum in Toxicology, 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 Institute of Health (NIH), Research Triangle Park, North Carolina, USA
3. Charles River Laboratories, Inc., Durham, North Carolina, USA
4. DNTP, Cellular and Molecular Pathology Branch, NIEHS, Research Triangle Park, North Carolina, USA
5. Division of Intramural Research, Biostatistics and Computational Biology Branch, NIEHS, Research Triangle Park, North Carolina, USA