Effectiveness of Hepatitis B Vaccination Campaign in Italy: Towards the Control of HBV Infection for the First Time in a European Country oleh Tommaso Stroffolini, Filomena Morisco, Luigina Ferrigno, Giuseppina Pontillo, Giuseppina Iantosca, Valentina Cossiga, Simonetta Crateri, Maria Elena Tosti, the SEIEVA Collaborating Group