Affiliation: | 3. Biotechnology Core Facility Branch, Scientific Resources, National Center forInfectious Diseases, Centers for Disease Control and Prevention, Public Health Service, U.S. Department of Health and Human Services, Atlanta, Georgia 30333 , USA;2. The D. I. Ivanovsky Institute of Virology, Moscow 123098, Russia;4. Institute of Hepatology, University College London, London, England;3. Department of Gastroenterology, Mannheim, Germany |