1. ExxonMobil Biomedical Sciences, Inc, Annandale, NJ, USA
2. West Con Toxicology, Brentwood, TN, USA
3. American Petroleum Institute, Washington, DC, USA
4. Huntingdon Life Sciences, East Millstone, NJ, USA
5. EcoTox Assessments, Saint Michaels, MD, USA
6. Shell Health Americas, Houston, TX, USA