1Okamoto H,Nishizawa T,Koto N,et al.Molecular cloning and characterization of a movel DNA Virus(TTV)associated with posttransfusion hepatitis of unknown etiology[].Hepatitis Res.1998
2Nishizawa T,OKamoto H,Konishi K,et al.A novel DNA virus(TTV) associated with elevated transaminase levels in posttransfusion hepatits of unknown etiology[].Biochemical and Biophysical Research Communications.1997