title: Prevention of hepatitis B virus infection by vaccination: Progress and problems.
authors.affiliation: Department of Gastroenrerology and Metabology, Ehime University Graduate School of Medicine, Ehime, Japan.
authors.forename: Kojiro
authors.initials: K
authors.lastname: Michitaka
authors.forename: Fazle
authors.initials: F
authors.lastname: Akbar
authors.forename: Morikazu
authors.initials: M
authors.lastname: Onji