Pegylated (40 KDA) interferon alfa-2a (Pegasys) in combination with ribavirin, mycophenolate mofetil (Cellcept), amantadine, or amantadine plus ribavirin in patients that did not respond to Rebetron therapy: a preliminary report of a randomized, multicenter study - Afdahl,N.; Flamm,S.; Imperial,J. (Gastroenterology, 2001)