1. Charles River Laboratories, Inc., Durham, North Carolina, USA
2. Pfizer, Inc., Pearl River, New York, USA
3. Wake Forest University, Winston-Salem, North Carolina, USA
4. Experimental Pathology Laboratories, Inc., Durham, North Carolina, USA
5. University of Michigan Medical School, Ann Arbor, Michigan, USA
6. The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA
7. North Carolina State University, Raleigh, North Carolina, USA
8. Duke University School of Medicine, Durham, North Carolina, USA