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References

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    Lampertico P, Del Ninno E, Viganò M, Romeo R, Donato MF, Sablon E, Morabito A, et al. Long-term suppression of hepatitis B e antigen-negative chronic hepatitis B by 24-month interferon therapy. Hepatology 2003; 37:756763.
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    Kunz R, Vist G, Oxman AD. Randomisation to protect against selection bias in healthcare trials (Cochrane Methodology Review). In: The Cochrane Library, 3, 2002. Oxford: Update Software, 2002.