RT Journal Article SR Electronic T1 Determinants of hepatitis B virus surface antigen positivity in adults attending sexually transmitted disease clinics in Italy. JF Genitourinary Medicine JO Genitourin Med FD BMJ Publishing Group Ltd SP 345 OP 346 DO 10.1136/sti.68.5.345 VO 68 IS 5 A1 Parazzini, F A1 D'oro, L C A1 Bianchi, C A1 Mezzanotte, C A1 Naldi, L A1 Imberti, G L A1 Pansera, B A1 Cainelli, T A1 Carlino, A A1 Graefemberghi, S YR 1992 UL http://sti.bmj.com/content/68/5/345.abstract AB