1. Department of Infectious Diseases, Merck Research Laboratories, Merck & Co., Inc., Kenilworth, New Jersey, USA
2. Department of In Vitro Pharmacology, Merck Research Laboratories, Merck & Co., Inc., Kenilworth, New Jersey, USA
3. Vaccine Research, Merck Research Laboratories, Merck & Co., Inc., Kenilworth, New Jersey, USA