1. Abbott Laboratories, Abbott Park, IL
2. GlaxoSmithKline, King of Prussia, PA
3. Pfizer, Groton, CT
4. Department of Pathobiology, College of Veterinary Medicine, University of Illinois, Urbana, IL
5. Merck, West Point, PA
6. WIL Research Laboratories, Ashland, OH
7. Roche Pharmaceuticals, Nutley, NJ