RT Journal Article SR Electronic T1 Mechanisms of immune escape in viral hepatitis JF Gut JO Gut FD BMJ Publishing Group Ltd and British Society of Gastroenterology SP 759 OP 764 DO 10.1136/gut.44.5.759 VO 44 IS 5 A1 W ROSENBERG YR 1999 UL http://gut.bmj.com/content/44/5/759.abstract AB