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OKAN, Abdullah et al. Frequency of HBsAg/anti-HCV seropositivity and its relationship with risk factors in extrahepatic malignancies. Turkish Journal of Gastroenterology, [S. l.], v. 9, n. 1, p. 28–31, 1998. Disponível em: https://www.turkjgastroenterol.org/index.php/tjg/article/view/850. Acesso em: 1 jan. 2026.