Upregulation of indoleamine 2,3-dioxygenase in hepatitis C virus infection. Bằng Larrea, E, Riezu-Boj, J, Gil-Guerrero, L, Casares, N, Aldabe, R, Sarobe, P, Civeira, M, Heeney, J, Rollier, C, Verstrepen, B, Wakita, T, Borrás-Cuesta, F, Lasarte, J, Prieto, J