1. Department of Large Animal Clinical Sciences, Michigan State University, East Lansing, Michigan.
2. Department of National Food Safety and Toxicology Center, Michigan State University, East Lansing, Michigan.
3. Bureau of Epidemiology, Michigan Department of Community Health, Lansing, Michigan.
4. Bureau of Laboratories, Michigan Department of Community Health, Lansing, Michigan.
5. Department of Epidemiology, Michigan State University, East Lansing, Michigan.
6. School of Public Health, University of Michigan, Ann Arbor, Michigan.