1. Charles River Laboratories, Spencerville, Ohio, USA
2. Charles River Laboratories, Senneville, Quebec, Canada
3. Experimental Pathology Laboratories, Sterling, Virginia, USA
4. C. M. Keenan ToxPath Consulting, Doylestown, Pennsylvania, USA
5. U.S. Food and Drug Administration, Silver Spring, Maryland, USA
6. Pathology, Drug Safety and Metabolism, IMED Biotech Unit, AstraZeneca, Boston, Massachusetts, USA