A randomized, controlled trial to determine whether continued ribavirin monotherapy in hepatitis C virus-infected patients who responded to interferon-ribavirin combination therapy will enhance sustained virologic response - Shiffman,M.L.; Hofmann,C.M.; Sterling,R.K.; Luketic,V.A.; Contos,M.J.; Sanyal,A.J. (J Infect Dis, 2001)