Division of Gastroenterology, University of Michigan Medical Center, Ann Arbor, MI, Virology Division, Department of Laboratory Medicine, University of Washington, Seattle, WA ; fax: 206-744-9858. ; Department of Laboratory Medicine, University of Washington, Box 359690, Seattle, WA 98104, Division of Gastroenterology, University of California???Irvine, Irvine, CA, and Gastroenterology Service, VA Long Beach Healthcare System, Long Beach, CA, Division of Digestive Diseases and Nutrition, National Institutes of Health, Department of Health and Human Services, Bethesda, MD, Office of the Director, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Department of Health and Human Services, Bethesda, MD, Virology Division, Department of Laboratory Medicine, University of Washington, Seattle, WA, Hepatology Section, Virginia Commonwealth University Medical Center, Richmond, VA, Section of Hepatology, Division of Gastroenterology and Hepatology, University of Colorado School of Medicine, Denver, CO, Division of Gastrointestinal and Liver Diseases, Keck School of Medicine, University of Southern California, Los Angeles, CA, Division of Digestive and Liver Diseases, University of Texas Southwestern Medical Center, Dallas, TX, Gastrointestinal Unit (Medical Services), Massachusetts General Hospital and the Department of Medicine, Harvard Medical School, Boston, MA, Liver Diseases Branch, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Department of Health and Human Services, Bethesda, MD, New England Research Institutes, Watertown, MA, Morishima, Chihiro, Morgan, Timothy R., Everhart, James E., Wright, Elizabeth C., Apodaca, Minjun C., Gretch, David R., Shiffman, Mitchell L., Everson, Gregory T., Lindsay, Karen L., Lee, William M., Lok, Anna S. F., Dienstag, Jules L., Ghany, Marc G., Curto, Teresa M., Division of Gastroenterology, University of Michigan Medical Center, Ann Arbor, MI, Virology Division, Department of Laboratory Medicine, University of Washington, Seattle, WA ; fax: 206-744-9858. ; Department of Laboratory Medicine, University of Washington, Box 359690, Seattle, WA 98104, Division of Gastroenterology, University of California???Irvine, Irvine, CA, and Gastroenterology Service, VA Long Beach Healthcare System, Long Beach, CA, Division of Digestive Diseases and Nutrition, National Institutes of Health, Department of Health and Human Services, Bethesda, MD, Office of the Director, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Department of Health and Human Services, Bethesda, MD, Virology Division, Department of Laboratory Medicine, University of Washington, Seattle, WA, Hepatology Section, Virginia Commonwealth University Medical Center, Richmond, VA, Section of Hepatology, Division of Gastroenterology and Hepatology, University of Colorado School of Medicine, Denver, CO, Division of Gastrointestinal and Liver Diseases, Keck School of Medicine, University of Southern California, Los Angeles, CA, Division of Digestive and Liver Diseases, University of Texas Southwestern Medical Center, Dallas, TX, Gastrointestinal Unit (Medical Services), Massachusetts General Hospital and the Department of Medicine, Harvard Medical School, Boston, MA, Liver Diseases Branch, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Department of Health and Human Services, Bethesda, MD, New England Research Institutes, Watertown, MA, Morishima, Chihiro, Morgan, Timothy R., Everhart, James E., Wright, Elizabeth C., Apodaca, Minjun C., Gretch, David R., Shiffman, Mitchell L., Everson, Gregory T., Lindsay, Karen L., Lee, William M., Lok, Anna S. F., Dienstag, Jules L., Ghany, Marc G., and Curto, Teresa M.