Determinants of hepatitis B virus surface antigen positivity in adults attending sexually transmitted disease clinics in Italy. Issue 5 (October 1992) - Parazzini, F; D'oro, L C; Bianchi, C; Mezzanotte, C; Naldi, L; Imberti, G L; Pansera, B; Cainelli, T; Carlino, A; Graefemberghi, S