Durability of sustained virologic response in patients with chronic hepatitis C after treatment with interferon α-2B alone or in combination with ribavirin: John G McHutchinson, Scripps Clinic, La Jolla, CA; Gary L Davis, University of Florida College of Medicine, Gainesville, FL; Rafael Esteban-Mur, Hospital Valle Hebrou, Barcelona Spain; Thierry Poynard, Hospitalier Pitie-Salpetriere, Paris France; Mei-Hsiu Ling, Jean-Jacques Garaud, Janice Albrecht For The International Hepatitis Interventional Therapy Group, Schering Plough Research Institute, Kenilworth, NJ