Clinical significance of low or negative titer of antibody to hepatitis B core antigen during the course of chronic hepatitis B virus infection in adolescents
1. Health and Medical Center, Okayama University, 1-1, 2-chome, Tsushima-Naka, 700, Okayama, Japan 2. First Department of Internal Medicine, Okayama University Medical School, Okayama, Japan 3. Kurashiki Central Hospital, Kurashiki, Japan