1. Infectious Disease Pathology Activity, Centers for Disease Control and Prevention, Atlanta, GA
2. Influenza Branch, Division of Viral and Rickettsial Diseases, National Center for Infectious Diseases, Centers for Disease Control and Prevention, Atlanta, GA
3. Office of the Medical Investigator, University of New Mexico School of Medicine, Albuquerque
4. National Cancer Institute, National Institutes of Health, Bethesda, MD