Silymarin use and liver disease progression in the Hepatitis C Antiviral Long-Term Treatment against Cirrhosis trial - Freedman, N D; Curto, T M; Morishima, C; Seeff, L B; Goodman, Z D; Wright, E C; Sinha, R; Everhart, J EHALT-C Trial Group (Aliment Pharmacol Ther, 2011)