1. Abbott Laboratories, Abbott Park, Illinois, USA
2. Pfizer, Groton, Connecticut, USA
3. Department of Pathobiology, College of Veterinary Medicine, University of Illinois, Urbana, Illinois, USA
4. Merck, West Point, Pennsylvania, USA
5. Amgen Inc, Thousand Oaks, California, USA
6. Roche Pharmaceuticals, Nutley, New Jersey, USA
7. GlaxoSmithKline, King of Prussia, Pennsylvania, USA