title: Immune response to hepatitis B vaccine in patients who lost hepatitis B surface antigen during follow up.
authors.affiliation: Second Department of Gastroenetrology, Evangelismos Hospital, Athens, Greece.
authors.forename: Georgios
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authors.lastname: Zacharakis
authors.forename: Nikos
authors.initials: N
authors.lastname: Viazis
authors.forename: Dimitrios G
authors.initials: DG
authors.lastname: Karamanolis
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