Since the institution of Taiwan's program of universal hepatitis B vaccination, the incidence of hepatocellular carcinoma in children has declined.

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We are researchers who have published analyses of nucleic acid sequence variation of hepatitis C virus (HCV) and associated virological and clinical significance. We are concerned that our investigations are hampered by the lack of a consensus nomenclature for variants of HCV and that this leads to confusion when results from different laboratories are compared. Furthermore, because there are no consistently applied criteria by which new genotypes are defined, investigators assign new type descriptions to novel sequence variants on an ad hoc basis without agreement from

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