1. Merck & Co., Inc., Sumneytown Pike, West Point, PA, USA
2. Seattle Genetics, Bothell, WA, USA
3. Charles River Laboratories, Inc., Reno, NV, USA
4. Boehringer Ingelheim, Ridgefield, CT, USA
5. Biogen, Cambridge, MA, USA
6. Lovelace Biomedical, Albuquerque, NM, USA