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Hepatitis B virus (HBV) infection is the major cause of chronic liver disease in Korea. This study investigated the seroprevalence of HBV infection with an emphasis on the coexistence of hepatitis B surface antigen (HBsAg) and antibody (anti‐HBs). In all, 290,212 people undergoing health check‐up examinations in 29 institutions during 2009 were recruited. The crude seroprevalences of HBsAg and anti‐HBs...
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