Clinical and epidemiological data of hepatitis c (hcv) and hepatitis (hbv) infection in patients from hepatitis outclinic of university hospital faculty of medicine of ribeirao preto - Martinelli, Ana de Lourdes Candolo; Souza, I D T; Vicentini, M V; Villanova, M G; Figueiredo, J F C; Passos, Afonso Dinis Costa; Covas, D T (Virologica 96: Encontro de Virologia, 1996)