Association of HLA antigens and TNF-a promoter alleles with primary sclerosing cholangitis - Palacios, S; Bittencourt, P; Cançado, E; Porta, G; Farias, A; Carrilho, Flair José; Marin, M; Kalil Filho, Jorge Elias; Laudanna, Antônio Atílio; Goldberg, A. C. (Annual Meeting of the Brazilian Society for Immunology, 1999)