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- [22] Efficacy and safety of 22 weeks of maintenance therapy with peginterferon alfa-2a(40KD)(pegasys)alone versus peginterferon alfa-2a plus ribavirin in naive, patients with chronic hepatitis c and genotype I who respond to a 24 week course therapy of peginterferon alfa-2a plus ribavirin: Preliminary results of an open, multicenter randomized trial. HEPATOLOGY, 2002, 36 (04) : 293A - 293A