Antifibrotic effect of silymarin in rat secondary biliary fibrosis is mediated by downregulation of procollagen alpha 1(I) and TIMP-1 - Jia,J.D.; Bauer,M.; Cho,J.J.; Ruehl,M.; Milani,S.; Boigk,G.; Riecken,E.O.; Schuppan,D. (J Hepatol, 2001)