Re-treatment of interferon (IFN) plus ribavirin (RBV) nonresponders with peginterferon (PEG-IFN) Alfa-2A (40KD) (Pegasys) plus RBV and amantadine (AMA) or IFN Alfa-2A (Roferon-A) plus RBV and AMA. Interim results of a multicenter randomized study - Brillanti, S.; Mangia, A.; Cimino, L.; Civolani, A.; Fatuzzo, F.; Fenoglio, L.; Levrero, M.; Minoli, G.; Persico, M.; Rumi, M.G. (Journal of Hepatology, 2003)