to date we have had 31 asymptomatic chronic hbs ag carriers in whom the time of hbv infection can be assumed , hbs ag in sera persisted for at least 6 months , laparoscopy with liver biopsy was performed within 6 to 21 months after the assumed hbv infection , and the clinical course after performance of laparoscopy with liver biopsy ranged from 6 months to 5 years has been observed , while with the lapse of time , blood biochemical liver function tests were examined once every 4 weeks .
C0023884
liver
C0193388
liver biopsy