1. Pfizer Research & Development, Cambridge, Massachusetts 02139, United States
2. Pfizer Research & Development, Groton, Connecticut 06340, United States
3. Pfizer Research & Development, Pearl River, New York 10965, United States
4. Pfizer Research & Development, La Jolla, California 92121, United States
5. Institute for Antiviral Research, Department of Animal, Dairy, and Veterinary Sciences, Utah State University, Logan, Utah 84322, United States