Factors associated with severe evolutive forms of chronic infection with hepatitis C virus - Cavalheiro, Norma; Vasconcelos, Romes Rufino; Tengan, Fatima Mitiko; Ibrahim, Karin Y.; Pereira, Haydée Marina do Valle; Barone, Antônio Alci (International Symposium on Hepatitis C Virus and Related Viruses, 2005)